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• Edit TabControl template in Silverlight project

  - by philbrowndotcom

  I'm trying to modify the template for the TabControl in my silverlight application. I used Expression Blend to get the Template and copied it into my project. I did this before for Expander and got it to work with a few minor adjustments. The template for TabControl references the ns/assembly "clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls" and uses the TabPanel control from it. I can't seem to make a reference to this. I'm using silverlight 3 and .NET 3 Thanks <UserControl.Resources> <ControlTemplate x:Key="mytemplate" TargetType="sdk:TabControl"> <Grid> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualStateGroup.Transitions> <VisualTransition GeneratedDuration="0"/> </VisualStateGroup.Transitions> <VisualState x:Name="Normal"/> <VisualState x:Name="Disabled"> <Storyboard> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="DisabledVisualTop"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualBottom"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualLeft"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualRight"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Grid x:Name="TemplateTop" Visibility="Collapsed"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelTop" Margin="2,2,2,-1" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0,0,3,3" MinWidth="10" MinHeight="10" Grid.Row="1"> <ContentPresenter x:Name="ContentTop" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualTop" Background="#8CFFFFFF" CornerRadius="0,0,3,3" IsHitTestVisible="False" Opacity="0" Grid.Row="1" Grid.RowSpan="2" Canvas.ZIndex="1"/> </Grid> <Grid x:Name="TemplateBottom" Visibility="Collapsed"> <Grid.RowDefinitions> <RowDefinition Height="*"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelBottom" Margin="2,-1,2,2" Grid.Row="1" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3,3,0,0" MinWidth="10" MinHeight="10"> <ContentPresenter x:Name="ContentBottom" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualBottom" Background="#8CFFFFFF" CornerRadius="3,3,0,0" IsHitTestVisible="False" Opacity="0" Canvas.ZIndex="1"/> </Grid> <Grid x:Name="TemplateLeft" Visibility="Collapsed"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelLeft" Margin="2,2,-1,2" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="1" CornerRadius="0,3,3,0" MinWidth="10" MinHeight="10"> <ContentPresenter x:Name="ContentLeft" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualLeft" Background="#8CFFFFFF" Grid.Column="1" CornerRadius="0,3,3,0" IsHitTestVisible="False" Opacity="0" Canvas.ZIndex="1"/> </Grid> <Grid x:Name="TemplateRight" Visibility="Collapsed"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="Auto"/> </Grid.ColumnDefinitions> <System_Windows_Controls_Primitives:TabPanel x:Name="TabPanelRight" Grid.Column="1" Margin="-1,2,2,2" Canvas.ZIndex="1"/> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3,0,0,3" MinWidth="10" MinHeight="10"> <ContentPresenter x:Name="ContentRight" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalAlignment}"/> </Border> <Border x:Name="DisabledVisualRight" Background="#8CFFFFFF" CornerRadius="3,0,0,3" IsHitTestVisible="False" Margin="0" Opacity="0" Canvas.ZIndex="1"/> </Grid> </Grid> </ControlTemplate> </UserControl.Resources>

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• Databind a datagrid header combobox from ViewModel

  - by Mike

  I've got a Datagrid with a column defined as this: <Custom:DataGridTextColumn HeaderStyle="{StaticResource ComboBoxHeader}" Width="Auto" Header="Type" Binding="{Binding Path=Type}" IsReadOnly="True" /> The ComboBoxHeader style is defined in a resource dictionary as this: <Style x:Key="ComboBoxHeader" TargetType="{x:Type my:DataGridColumnHeader}"> <Setter Property="VerticalContentAlignment" Value="Center"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type my:DataGridColumnHeader}"> <ControlTemplate.Resources> <Storyboard x:Key="ShowFilterControl"> <ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="filterComboBox" Storyboard.TargetProperty="(UIElement.Visibility)"> <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.5000000" Value="{x:Static Visibility.Visible}"/> </ObjectAnimationUsingKeyFrames> <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="filterComboBox" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"> <SplineColorKeyFrame KeyTime="00:00:00" Value="Transparent"/> <SplineColorKeyFrame KeyTime="00:00:00.5000000" Value="White"/> </ColorAnimationUsingKeyFrames> </Storyboard> <Storyboard x:Key="HideFilterControl"> <ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="filterComboBox" Storyboard.TargetProperty="(UIElement.Visibility)"> <DiscreteObjectKeyFrame KeyTime="00:00:00.4000000" Value="{x:Static Visibility.Collapsed}"/> </ObjectAnimationUsingKeyFrames> <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="filterComboBox" Storyboard.TargetProperty="(UIElement.OpacityMask).(SolidColorBrush.Color)"> <SplineColorKeyFrame KeyTime="00:00:00" Value="Black"/> <SplineColorKeyFrame KeyTime="00:00:00.4000000" Value="#00000000"/> </ColorAnimationUsingKeyFrames> </Storyboard> </ControlTemplate.Resources> <my:DataGridHeaderBorder x:Name="dataGridHeaderBorder" Margin="0" VerticalAlignment="Top" Height="31" IsClickable="{TemplateBinding CanUserSort}" IsHovered="{TemplateBinding IsMouseOver}" IsPressed="{TemplateBinding IsPressed}" SeparatorBrush="{TemplateBinding SeparatorBrush}" SeparatorVisibility="{TemplateBinding SeparatorVisibility}" SortDirection="{TemplateBinding SortDirection}" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.ColumnSpan="1"> <Grid x:Name="grid" Width="Auto" Height="Auto" RenderTransformOrigin="0.5,0.5"> <Grid.RenderTransform> <TransformGroup> <ScaleTransform/> <SkewTransform/> <RotateTransform/> <TranslateTransform/> </TransformGroup> </Grid.RenderTransform> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <ContentPresenter x:Name="contentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentStringFormat="{TemplateBinding ContentStringFormat}" ContentTemplate="{TemplateBinding ContentTemplate}"> <ContentPresenter.Content> <MultiBinding Converter="{StaticResource headerConverter}"> <MultiBinding.Bindings> <Binding ElementName="filterComboBox" Path="Text" /> <Binding RelativeSource="{RelativeSource TemplatedParent}" Path="Content" /> </MultiBinding.Bindings> </MultiBinding> </ContentPresenter.Content> </ContentPresenter> <ComboBox ItemsSource="{Binding Path=Types}" x:Name="filterComboBox" VerticalAlignment="Center" HorizontalAlignment="Right" MinWidth="20" Height="Auto" OpacityMask="Black" Visibility="Collapsed" Text="" Grid.Column="0" Grid.ColumnSpan="1"/> </Grid> </my:DataGridHeaderBorder> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Trigger.EnterActions> <BeginStoryboard x:Name="ShowFilterControl_BeginStoryboard" Storyboard="{StaticResource ShowFilterControl}"/> <StopStoryboard BeginStoryboardName="HideFilterControl_BeginShowFilterControl"/> </Trigger.EnterActions> <Trigger.ExitActions> <BeginStoryboard x:Name="HideFilterControl_BeginShowFilterControl" Storyboard="{StaticResource HideFilterControl}"/> <StopStoryboard BeginStoryboardName="ShowFilterControl_BeginStoryboard"/> </Trigger.ExitActions> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> <Setter Property="Background"> <Setter.Value> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FF0067AD" Offset="1"/> <GradientStop Color="#FF003355" Offset="0.5"/> <GradientStop Color="#FF78A8C9" Offset="0"/> </LinearGradientBrush> </Setter.Value> </Setter> <Setter Property="Foreground" Value="White"/> <Setter Property="BorderBrush"> <Setter.Value> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#D8000000" Offset="0.664"/> <GradientStop Color="#7F003355" Offset="1"/> </LinearGradientBrush> </Setter.Value> </Setter> <Setter Property="FontWeight" Value="Bold"/> <Setter Property="BorderThickness" Value="1,1,1,0"/> <Setter Property="HorizontalContentAlignment" Value="Center"/> <Setter Property="Padding" Value="5,0"/> </Style> As you can see, I'm trying to databind the combobox's ItemsSource to Types, but this doesn't work. The list is in my ViewModel that is being applied to my page, how would I specify in this style that is in my resource dictionary that I want to bind to a source in my viewmodel.

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• WPF - Overlapping Custom Tabs in a TabControl and ZIndex

  - by Rachel

  Problem I have a custom tab control using Chrome-shaped tabs that binds to a ViewModel. Because of the shape, the edges overlap a bit. I have a function that sets the tabItem's ZIndex on TabControl_SelectionChanged which works fine for selecting tabs, and dragging/dropping tabs, however when I Add or Close a tab via a Relay Command I am getting unusual results. Does anyone have any ideas? Default View http://i193.photobucket.com/albums/z197/Lady53461/tabs_default.jpg Removing Tabs http:/i193.photobucket.com/albums/z197/Lady53461/tabs_removing.jpg Adding 2 or more Tabs in a row http:/i193.photobucket.com/albums/z197/Lady53461/tabs_adding.jpg Code to set ZIndex private void PrimaryTabControl_SelectionChanged(object sender, SelectionChangedEventArgs e) { if (e.Source is TabControl) { TabControl tabControl = sender as TabControl; ItemContainerGenerator icg = tabControl.ItemContainerGenerator; if (icg.Status == System.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated) { foreach (object o in tabControl.Items) { UIElement tabItem = icg.ContainerFromItem(o) as UIElement; Panel.SetZIndex(tabItem, (o == tabControl.SelectedItem ? 100 : 90 - tabControl.Items.IndexOf(o))); } } } } By using breakpoints I can see that it is correctly setting the ZIndex to what I want it to, however the layout is not displaying the changes. I know some of the changes are in effect because if none of them were working then the tab edges would be reversed (the right tabs would be drawn on top of the left ones). Clicking a tab will correctly set the zindex of all tabs (including the one that should be drawn on top) and dragging/dropping them to rearrange them also renders correctly (which removes and reinserts the tab item). The only difference I can think of is I am using the MVVM design pattern and the buttons that Add/Close tabs are relay commands. Does anyone have any idea why this is happening and how I can fix it?? p.s. I did try setting a ZIndex in my ViewModel and binding to it, however the same thing happens when adding/removing tabs via the relay command. EDIT: Being a new user I couldn't post images and could only post 1 link. Images just show a picture of what the tags render as after each scenario. Adding more then 1 at a time will not reset the zindex of other recently-added tabs so they go behind the tab on the Right, and closing tabs does not correctly render the ZIndex of the SelectedTab that replaces it and it shows up behind the tab on its right.

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• How can I load style resources from a dynamically loaded Silverlight application (XAP)?

  - by Tom

  I've followed Tim Heuer's video for dynamically loading other XAP's (into a 'master' Silverlight application), as well as some other links to tweak the loading of resources and am stuck on the particular issue of loading style resources from within the dynamically loaded XAP (i.e. the contents of Assets\Styles.xaml). When I run the master/hosting applcation, it successfully streams the dynamic XAP and I can read the deployment info etc. and load the assembly parts. However, when I actuall try to create an instance of a form from the Dynamic XAP, it fails with Cannot find a Resource with the Name/Key LayoutRootGridStyle which is in it's Assets\Styles.xaml file (it works if I run it directly so I know it's OK). For some reason these don't show up as application resources - not sure if I've totally got the wrong end of the stick, or am just missing something? Code snippet below (apologies it's a bit messy - just trying to get it working first) ... '' # Here's the code that reads the dynamic XAP from the web server ... '' #... wCli = New WebClient AddHandler wCli.OpenReadCompleted, AddressOf OpenXAPCompleted wCli.OpenReadAsync(New Uri("MyTest.xap", UriKind.Relative)) '' #... '' #Here's the sub that's called when openread is completed '' #... Private Sub OpenXAPCompleted(ByVal sender As Object, ByVal e As System.Net.OpenReadCompletedEventArgs) Dim sManifest As String = New StreamReader(Application.GetResourceStream(New StreamResourceInfo(e.Result, Nothing), New Uri("AppManifest.xaml", UriKind.Relative)).Stream).ReadToEnd Dim deploymentRoot As XElement = XDocument.Parse(sManifest).Root Dim deploymentParts As List(Of XElement) = _ (From assemblyParts In deploymentRoot.Elements().Elements() Select assemblyParts).ToList() Dim oAssembly As Assembly = Nothing For Each xElement As XElement In deploymentParts Dim asmPart As AssemblyPart = New AssemblyPart() Dim source As String = xElement.Attribute("Source").Value Dim sInfo As StreamResourceInfo = Application.GetResourceStream(New StreamResourceInfo(e.Result, "application/binary"), New Uri(source, UriKind.Relative)) If source = "MyTest.dll" Then oAssembly = asmPart.Load(sInfo.Stream) Else asmPart.Load(sInfo.Stream) End If Next Dim t As Type() = oAssembly.GetTypes() Dim AppClass = (From parts In t Where parts.FullName.EndsWith(".App") Select parts).SingleOrDefault() Dim mykeys As Array If Not AppClass Is Nothing Then Dim a As Application = DirectCast(oAssembly.CreateInstance(AppClass.FullName), Application) For Each strKey As String In a.Resources.Keys If Not Application.Current.Resources.Contains(strKey) Then Application.Current.Resources.Add(strKey, a.Resources(strKey)) End If Next End If Dim objectType As Type = oAssembly.GetType("MyTest.MainPage") Dim ouiel = Activator.CreateInstance(objectType) Dim myData As UIElement = DirectCast(ouiel, UIElement) Me.splMain.Children.Add(myData) Me.splMain.UpdateLayout() End Sub '' #... '' # And here's the line that fails with "Cannot find a Resource with the Name/Key LayoutRootGridStyle" '' # ... System.Windows.Application.LoadComponent(Me, New System.Uri("/MyTest;component/MainPage.xaml", System.UriKind.Relative)) '' #... any thoughts?

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• What should be owner type of a routed command?

  - by viky

  I am using wpf Custom Commands. While writing a custom Command, you need to define the owner type. Description says that it is the type that is registering the command. I was seeing some sample and there the Owner type was UIElement and in some others it was the class name itself. Whats the difference? What should be the owner type?

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• WPF Open Combobox popup on Focus or GotFocus

  - by ashish.magroria

  Hi, I am trying to open the combobox popup when it is focused using Style/Event Trigger I used the following code in my Combobox control Template: <ControlTemplate x:Key="ComboBoxTemplate" TargetType="{x:Type ComboBox}"> <Grid > <ToggleButton Grid.Column="2" Template="{DynamicResource ComboBoxToggleButton}" x:Name="ToggleButton" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/> <ContentPresenter HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="ContentSite" VerticalAlignment="Center" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" IsHitTestVisible="False"/> <TextBox Visibility="Hidden" Template="{DynamicResource ComboBoxTextBox}" HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="PART_EditableTextBox" Style="{x:Null}" VerticalAlignment="Center" Focusable="True" Background="Transparent" IsReadOnly="{TemplateBinding IsReadOnly}"/> <Popup IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" x:Name="Popup" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide"> <Grid MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}" x:Name="DropDown" SnapsToDevicePixels="True"> <Border x:Name="DropDownBorder" Background="{DynamicResource ShadeBrush}" BorderBrush="{DynamicResource SolidBorderBrush}" BorderThickness="1"/> <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" CanContentScroll="True"> <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained"/> </ScrollViewer> </Grid> </Popup> </Grid> <ControlTemplate.Triggers> **<Trigger Property="IsMouseOver" Value="True"> <Setter Property="IsOpen" Value="True" TargetName="Popup"/> </Trigger>** </ControlTemplate.Triggers> </ControlTemplate> But nothing happens with this code. So I trid the following Event trigger in ControlTemplate.Triggers <EventTrigger RoutedEvent="UIElement.GotFocus"> <BeginStoryboard> <Storyboard > <BooleanAnimationUsingKeyFrames Storyboard.TargetName="Popup" Storyboard.TargetProperty="IsOpen" FillBehavior="HoldEnd"> <DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="True" /> </BooleanAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="UIElement.LostFocus"> <BeginStoryboard> <Storyboard > <BooleanAnimationUsingKeyFrames Storyboard.TargetName="Popup" Storyboard.TargetProperty="IsOpen" FillBehavior="HoldEnd"> <DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="False" /> </BooleanAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> Now this helps open the popup on focus, but when I select any item from dropdown the pop up doesnt disappear as usual; it stays open. it closes only after I click somewhere else in the window. Can someone please suggest the proper way to do this Thanks in advance

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• How does one enhance Silverlight WritableBitmap quality when replacing UIElements for animations

  - by Stephen Ellis

  I'm doing an animation where I temporarily drop down the visibility of UIElements and overlay WritableBitmap versions of the original Image. The problem I have is that when I do this on element with text, it results in a noticeably blurry and darker image meaning the switch from UIElement to Image is noticeable. Has anyone experienced this and/or know how to deal with this issue?

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• Is it possible to hide the doc icon programmatically

  - by Unicorn

  Is it possible to hide doc icon programmatically on demand. I know one way by which defining property "Application is agent (UIElement)" in plist we make the cocoa app as user agent. But this result in hiding the doc icon permanently. I am looking for a way where i can control visibility of doc icon. Any idea ?

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• Exception showing a erroneous web page in a WPF frame

  - by H4mm3rHead

  I have a small application where i need to navigate to an url, I use this method to get the Frame: public override System.Windows.UIElement GetPage(System.Windows.UIElement container) { XmlDocument doc = new XmlDocument(); doc.Load(Location); string webSiteUrl = doc.SelectSingleNode("website").InnerText; Frame newFrame = new Frame(); if (!webSiteUrl.StartsWith("http://")) { webSiteUrl = "http://" + webSiteUrl; } newFrame.Source = new Uri(webSiteUrl); return newFrame; } My problem is now that the page im trying to show generates a error (or so i think), when i load the page in a browser it never fully loads, keeps saying "loading1 element" in the load bar and the green progress line (IE 8) keeps showing. When i attach my debugger i get this error: System.ArgumentException was unhandled Message="Parameter and value pair is not valid. Expected form is parameter=value." Source="WindowsBase" StackTrace: at MS.Internal.ContentType.ParseParameterAndValue(String parameterAndValue) at MS.Internal.ContentType..ctor(String contentType) at MS.Internal.WpfWebRequestHelper.GetContentType(WebResponse response) at System.Windows.Navigation.NavigationService.GetObjectFromResponse(WebRequest request, WebResponse response, Uri destinationUri, Object navState) at System.Windows.Navigation.NavigationService.HandleWebResponse(IAsyncResult ar) at System.Windows.Navigation.NavigationService.<>c__DisplayClassc.<HandleWebResponseOnRightDispatcher>b__8(Object unused) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler) ved System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.TranslateAndDispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Application.RunInternal(Window window) at GreenWebPlayerWPF.App.Main() i C:\Development\Hvarregaard\GWDS\GreenWeb\GreenWebPlayerWPF\obj\Debug\App.g.cs:linje 0 at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: Anyone? Or any way to capture it and respond to it, tried a try/catch around my code, but its not caught - seems something deep inside the guts of the CLR is failing.

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• Is it possible to hide the dock icon programmatically

  - by Unicorn

  Is it possible to hide dock icon programmatically on demand. I know one way by which defining property "Application is agent (UIElement)" in plist we make the cocoa app as user agent. But this result in hiding the dock icon permanently. I am looking for a way where i can control visibility of dock icon. Any idea ?

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• Programmatically Binding to a Property

  - by M312V

  I know it's a generic title, but my question is specific. I think it will boil down to a question of practice. So, I have the following code: public class Component : UIElement { public Component() { this.InputBindings.Add(new MouseBinding(SomeCommandProperty, new MouseGesture(MouseAction.LeftClick))); } } I could easily aggregate the ViewModel that owns SomeCommandProperty into the Component class, but I'm currently waiving that option assuming there is another way. Component is a child of ComponentCollection which is child of a Grid which DataContext is the ViewModel. ComponentCollection as the name suggests contains a collection of Components. <Grid Name="myGrid"> <someNamespace:ComponentCollection x:Name="componentCollection"/> </Grid> It's the same scenario as the XAML below, but with TextBlock. I guess I'm trying to replicate what's being done in the XAML below programatically. Again, Component's top most ancestor's DataContext is set to ViewModel. <Grid Name="myGrid"> <TextBlock Text="SomeText"> <TextBlock.InputBindings> <MouseBinding Command="{Binding SomeCommandProperty}" MouseAction="LeftClick" /> </TextBlock.InputBindings> </TextBlock> </Grid> Update 1 Sorry, I'm unable to comment because I lack the reputation points. Basically, I have a custom control which inherit from a Panel which children are a collection of Component. It's not a hack, like I've mentioned, I could directly have access to SomeCommandProperty If I aggregate the ViewModel into Component. Doing so, however, feels icky. That is, having direct access to ViewModel from a Model. I guess the question I'm asking is. Given the situation that Component's parent UIElement's DataContext is set to ViewModel, is it possible to access SomeCommandProperty without Component owning a reference to the ViewModel that owns SomeCommandProperty? Programatically, that is. Using ItemsControl doesn't change the fact that I still need to bind SomeCommandProperty to each Items.

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• How do you make the scale animation begin at the middle of the object instead of the top left?

  - by Roy

  What I am trying to accomplish: 10 percent increase scale transformation of a rectangle via Silverlight storyboard animation. What I currently doing: While in Expression Blend 3, I created a rectangle, created a storyboard, and created the scale transformation. The preview looked correct because the increase in scale begins in the middle of the object. When I run the project the scale transformation begins at the top left. Is there some piece of code missing? Here is my current code: <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="TestingGroundsWebsite.MainPage" Width="640" Height="480"> <UserControl.Resources> <Storyboard x:Name="RectangleAppear"> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="rectangle" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"> <EasingDoubleKeyFrame KeyTime="00:00:00" Value="0.1"/> <EasingDoubleKeyFrame KeyTime="00:00:01" Value="1.1"/> <EasingDoubleKeyFrame KeyTime="00:00:02" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="rectangle" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)"> <EasingDoubleKeyFrame KeyTime="00:00:00" Value="0.1"/> <EasingDoubleKeyFrame KeyTime="00:00:01" Value="1.1"/> <EasingDoubleKeyFrame KeyTime="00:00:02" Value="1"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </UserControl.Resources> <Canvas x:Name="LayoutRoot" Background="White"> <Rectangle x:Name="rectangle" Fill="#FFE80000" Stroke="Black" Height="75" Width="76" Canvas.Left="227" Canvas.Top="167" RenderTransformOrigin="0.5,0.5"> <Rectangle.RenderTransform> <TransformGroup> <ScaleTransform/> <SkewTransform/> <RotateTransform/> <TranslateTransform/> </TransformGroup> </Rectangle.RenderTransform> </Rectangle> </Canvas> </UserControl> Thanks

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• How to programmatically create customcontrol and change its values in Silverlight 4

  - by user361317

  Hi! I want to create a custom tabcontrol class which has an icon before the text, and I want to be able to change the icon in the constructor of the new tabcontrol. I use implicit styles in Silverlight 4, and the custom tabcontrol should not have any xaml of its own, just the class and the implicit xaml style in my App.xaml. I cannot, however, get this to work. This is my code: <!-- Style for generic tabcontrols --> 20,0,0,0 <Style TargetType="controls:TabItem"> <Setter Property="IsTabStop" Value="False"/> <Setter Property="Background" Value="#FFDBEDFB"/> <Setter Property="BorderBrush" Value="#FFA3AEB9"/> <Setter Property="BorderThickness" Value="1"/> <Setter Property="Padding" Value="6,2,6,2"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> <Setter Property="VerticalContentAlignment" Value="Stretch"/> <Setter Property="MinWidth" Value="5"/> <Setter Property="MinHeight" Value="5"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="controls:TabItem"> <Grid x:Name="Root" Cursor="Hand" Height="25"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualStateGroup.Transitions> <VisualTransition GeneratedDuration="0"/> <VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver"/> </VisualStateGroup.Transitions> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"> <Storyboard> <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetName="FocusVisualTop" Storyboard.TargetProperty="(UIElement.Opacity)"> <SplineDoubleKeyFrame KeyTime="0" Value="0"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Disabled"> <Storyboard> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="DisabledVisualTopSelected" Storyboard.TargetProperty="(UIElement.Opacity)"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="DisabledVisualTopUnSelected" Storyboard.TargetProperty="(UIElement.Opacity)"> <SplineDoubleKeyFrame KeyTime="0" Value="1"/> </DoubleAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="SelectionStates"> <VisualState x:Name="Unselected"/> <VisualState x:Name="Selected"/> </VisualStateGroup> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"> <Storyboard> <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="FocusVisualTop" Storyboard.TargetProperty="Visibility"> <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Unfocused"> <Storyboard> <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Visibility"> <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Grid x:Name="TemplateTopUnselected" Margin="1"> <Border x:Name="BorderTop" BorderThickness="1,1,1,0"> <Border x:Name="GradientTop" BorderThickness="1,1,1,0" CornerRadius="5,5,0,0"> <Border.BorderBrush> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFB1CCEE" Offset="0"/> <GradientStop Color="#CCB1CCEE" Offset="1"/> </LinearGradientBrush> </Border.BorderBrush> <Border.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFCEE0F7" Offset="0.091"/> <GradientStop Color="#FFDEECFD" Offset="0.996"/> <GradientStop Color="White"/> </LinearGradientBrush> </Border.Background> <Grid Margin="3,3,3,2"> <Grid.RowDefinitions> <RowDefinition Height="16"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="16"/> <ColumnDefinition/> <ColumnDefinition Width="15"/> </Grid.ColumnDefinitions> <Image x:Name="TabInactiveIcon" Source="group.png" Margin="0" HorizontalAlignment="Center" VerticalAlignment="Center" Opacity="0.395"/> <ContentControl x:Name="HeaderTopUnselected" Cursor="{TemplateBinding Cursor}" Margin="3,0" FontSize="{TemplateBinding FontSize}" Foreground="#FF416AA3" IsTabStop="False" FontFamily="Tahoma" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="TabInactiveCloseButton" Template="{StaticResource TabItemCloseButton}" Cursor="Hand" Height="10" HorizontalAlignment="Right" Margin="0" VerticalAlignment="Top" Width="10" Content="Button" Grid.Column="2" d:LayoutOverrides="GridBox"/> </Grid> </Border> </Border> <Border x:Name="DisabledVisualTopUnSelected" IsHitTestVisible="false" Opacity="0" Background="#8CFFFFFF" CornerRadius="3,3,0,0"/> </Grid> <Border x:Name="FocusVisualElement" Margin="-1" IsHitTestVisible="false" Visibility="Collapsed" BorderBrush="#FF6DBDD1" BorderThickness="1" CornerRadius="3,3,0,0"/> <Grid x:Name="TemplateTopSelected" Margin="0,0,0,-3" Visibility="Collapsed"> <Border x:Name="BorderTop1" BorderThickness="1,1,1,0"> <Border x:Name="GradientTop1" BorderThickness="1,1,1,0" CornerRadius="5,5,0,0"> <Border.BorderBrush> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFB1CCEE" Offset="0"/> <GradientStop Color="#CAB1CCEE" Offset="1"/> </LinearGradientBrush> </Border.BorderBrush> <Border.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFCEE0F7" Offset="0.091"/> <GradientStop Color="White" Offset="0.974"/> <GradientStop Color="White"/> </LinearGradientBrush> </Border.Background> <Grid Margin="3,3,3,2"> <Grid.RowDefinitions> <RowDefinition Height="16"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="16"/> <ColumnDefinition/> <ColumnDefinition Width="15"/> </Grid.ColumnDefinitions> <Image x:Name="TabActiveIcon" Source="user.png" Margin="0" HorizontalAlignment="Center" VerticalAlignment="Center"/> <ContentControl x:Name="HeaderTopSelected" Cursor="{TemplateBinding Cursor}" Margin="3,0" FontSize="{TemplateBinding FontSize}" Foreground="#FF416AA3" IsTabStop="False" FontFamily="Tahoma" FontWeight="Bold" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center"/> <Button x:Name="TabActiveCloseButton" Template="{StaticResource TabActiveCloseButton}" Cursor="Hand" Height="10" HorizontalAlignment="Right" Margin="0" VerticalAlignment="Top" Width="10" Content="Button" Grid.Column="2" d:LayoutOverrides="GridBox"/> </Grid> </Border> </Border> <Border x:Name="FocusVisualTop" Margin="-2,-2,-2,0" IsHitTestVisible="false" Visibility="Collapsed" BorderThickness="1,1,1,0" CornerRadius="3,3,0,0"/> <Border x:Name="DisabledVisualTopSelected" Margin="-2,-2,-2,0" IsHitTestVisible="false" Opacity="0" Background="#8CFFFFFF" CornerRadius="3,3,0,0"/> </Grid> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> and my class public class ClosableTabItem : TabItem { public static readonly DependencyProperty TabIconProperty = DependencyProperty.RegisterAttached("TabInactiveIcon", typeof(Image), typeof(ClosableTabItem), null); public Image TabIcon { get { return (Image)GetValue(ClosableTabItem.TabIconProperty); } set { SetValue(ClosableTabItem.TabIconProperty, value); } } public ClosableTabItem(string header, ContentControl content, TabItemIcons icon) { // I need to be able to set the header, content and icon here } private Image GetTabIcon(TabItemIcons icon) { Image img = new Image(); switch (icon) { case TabItemIcons.User: img.Source = new BitmapImage(new Uri("/icons/user.png", UriKind.Relative)); break; case TabItemIcons.Group: img.Source = new BitmapImage(new Uri("/icons/group.png", UriKind.Relative)); break; default: break; } return img; } } This is driving me nuts, and I can't find any examples where anyone has done this without having a xaml page for the custom tab. Is this even possible? Can someone point me in the right direction? Cheers! - jonah

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• ScrollViewer.EnsureVisible for Windows Phone

  - by Daniel Moth

  In my Translator By Moth app, on both the current and saved pivot pages the need arose to programmatically scroll to the bottom. In the former, case it is when a translation takes place (if the text is too long, I want to scroll to the bottom of the translation so the user can focus on that, and not their input text for translation). In the latter case it was when a new translation is saved (it is added to the bottom of the list, so scrolling is required to make it visible). On both pages a ScrollViewer is used. In my exploration of the APIs through intellisense and msdn I could not find a method that auto scrolled to the bottom. So I hacked together a solution where I added a blank textblock to the bottom of each page (within the ScrollViewer, but above the translated textblock and the saved list) and tried to make it scroll it into view from code. After searching the web I found a little algorithm that did most of what I wanted (sorry, I do not have the reference handy, but thank you whoever it was) that after minor tweaking I turned into an extension method for the ScrollViewer that is very easy to use: this.Scroller.EnsureVisible(this.BlankText); The method itself I share with you here: public static void EnsureVisible(this System.Windows.Controls.ScrollViewer scroller, System.Windows.UIElement uiElem) { System.Diagnostics.Debug.Assert(scroller != null); System.Diagnostics.Debug.Assert(uiElem != null); scroller.UpdateLayout(); double maxScrollPos = scroller.ExtentHeight - scroller.ViewportHeight; double scrollPos = scroller.VerticalOffset - scroller.TransformToVisual(uiElem).Transform(new System.Windows.Point(0, 0)).Y; if (scrollPos > maxScrollPos) scrollPos = maxScrollPos; else if (scrollPos < 0) scrollPos = 0; scroller.ScrollToVerticalOffset(scrollPos); } I am sure there are better ways, but this "worked for me" :-) Comments about this post by Daniel Moth welcome at the original blog.

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• Bing maps silverlight control custom pushpin

  - by Razvi

  I tried to make a custom pushpin for the Bing Maps silverlight control, but I can only add 1 pushpin. At the second pushpin I get the following error: System.ArgumentException: Value does not fall within the expected range. at MS.Internal.XcpImports.CheckHResult(UInt32 hr) at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection`1 collection, CValue value) at MS.Internal.XcpImports.Collection_AddDependencyObject[T](PresentationFrameworkCollection`1 collection, DependencyObject value) at System.Windows.PresentationFrameworkCollection`1.AddDependencyObject(DependencyObject value) at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value) at System.Windows.PresentationFrameworkCollection`1.Add(T value) at MapInfo.Silverlight.CitiesControl.MainPage.c_GetCitiesCompleted(Object sender, GetCitiesCompletedEventArgs e) Does anyone know what I might be doing wrong? I am setting the following properties before adding it to the map: public Location Location { get { return this.GetValue(MapLayer.PositionProperty) as Location; } set { this.SetValue(MapLayer.PositionProperty, value); } } this.SetValue(MapLayer.PositionOriginProperty, PositionOrigin.BottomLeft);

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• Setting a WPF ContextMenu's PlacementTarget property in XAML?

  - by qntmfred

  <Button Name="btnFoo" Content="Foo" > <Button.ContextMenu Placement="Bottom" PlacementTarget="btnFoo"> <MenuItem Header="Bar" /> </Button.ContextMenu> </Button> gives me a runtime error 'UIElement' type does not have a public TypeConverter class I also tried <Button Name="btnFoo" Content="Foo" > <Button.ContextMenu Placement="Bottom" PlacementTarget="{Binding ElementName=btnFoo}"> <MenuItem Header="Bar" /> </Button.ContextMenu> </Button> and that put the ContextMenu in the top left corner of my screen, rather than at the Button

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• WPF: how to find an element in a datatemplate from an itemscontrol

  - by EV

  Hi, I have the following problem: the application is using the custom itemscontrol called ToolBox. The elements of a toolbox are called toolboxitems and are custom contentcontrol. Now, the toolbox stores a number of images that are retrieved from a database and displayed. For that I use a datatemplate inside the toolbox control. However, when I try to drag and drop the elements, I don't get the image object but the database component. I thought that I should then traverse the structure to find the Image element. here's the code: Toolbox: public class Toolbox : ItemsControl { private Size defaultItemSize = new Size(65, 65); public Size DefaultItemSize { get { return this.defaultItemSize; } set { this.defaultItemSize = value; } } protected override DependencyObject GetContainerForItemOverride() { return new ToolboxItem(); } protected override bool IsItemItsOwnContainerOverride(object item) { return (item is ToolboxItem); } } ToolBoxItem: public class ToolboxItem : ContentControl { private Point? dragStartPoint = null; static ToolboxItem() { FrameworkElement.DefaultStyleKeyProperty.OverrideMetadata(typeof(ToolboxItem), new FrameworkPropertyMetadata(typeof(ToolboxItem))); } protected override void OnPreviewMouseDown(MouseButtonEventArgs e) { base.OnPreviewMouseDown(e); this.dragStartPoint = new Point?(e.GetPosition(this)); } public String url { get; private set; } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (e.LeftButton != MouseButtonState.Pressed) { this.dragStartPoint = null; } if (this.dragStartPoint.HasValue) { Point position = e.GetPosition(this); if ((SystemParameters.MinimumHorizontalDragDistance <= Math.Abs((double)(position.X - this.dragStartPoint.Value.X))) || (SystemParameters.MinimumVerticalDragDistance <= Math.Abs((double)(position.Y - this.dragStartPoint.Value.Y)))) { string xamlString = XamlWriter.Save(this.Content); MessageBoxResult result = MessageBox.Show(xamlString); DataObject dataObject = new DataObject("DESIGNER_ITEM", xamlString); if (dataObject != null) { DragDrop.DoDragDrop(this, dataObject, DragDropEffects.Copy); } } e.Handled = true; } } private childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject { for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++) { DependencyObject child = VisualTreeHelper.GetChild(obj, i); if (child != null && child is childItem) return (childItem)child; else { childItem childOfChild = FindVisualChild<childItem>(child); if (childOfChild != null) return childOfChild; } } return null; } } here is the xaml file for ToolBox and toolbox item: <Style TargetType="{x:Type s:ToolboxItem}"> <Setter Property="Control.Padding" Value="5" /> <Setter Property="ContentControl.HorizontalContentAlignment" Value="Stretch" /> <Setter Property="ContentControl.VerticalContentAlignment" Value="Stretch" /> <Setter Property="ToolTip" Value="{Binding ToolTip}" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type s:ToolboxItem}"> <Grid> <Rectangle Name="Border" StrokeThickness="1" StrokeDashArray="2" Fill="Transparent" SnapsToDevicePixels="true" /> <ContentPresenter Content="{TemplateBinding ContentControl.Content}" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" ContentTemplate="{TemplateBinding ContentTemplate}"/> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="true"> <Setter TargetName="Border" Property="Stroke" Value="Gray" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="{x:Type s:Toolbox}"> <Setter Property="SnapsToDevicePixels" Value="true" /> <Setter Property="Focusable" Value="False" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate> <Border BorderThickness="{TemplateBinding Border.BorderThickness}" Padding="{TemplateBinding Control.Padding}" BorderBrush="{TemplateBinding Border.BorderBrush}" Background="{TemplateBinding Panel.Background}" SnapsToDevicePixels="True"> <ScrollViewer VerticalScrollBarVisibility="Auto"> <ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" /> </ScrollViewer> </Border> </ControlTemplate> </Setter.Value> </Setter> <Setter Property="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <WrapPanel Margin="0,5,0,5" ItemHeight="{Binding Path=DefaultItemSize.Height, RelativeSource={RelativeSource AncestorType=s:Toolbox}}" ItemWidth="{Binding Path=DefaultItemSize.Width, RelativeSource={RelativeSource AncestorType=s:Toolbox}}" /> </ItemsPanelTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> Example usage: <Toolbox x:Name="NewLibrary" DefaultItemSize="55,55" ItemsSource="{Binding}" > <ItemsControl.ItemTemplate> <DataTemplate> <StackPanel> <Image Source="{Binding Path=url}" /> </StackPanel> </DataTemplate> </ItemsControl.ItemTemplate> </Toolbox> The object that I get is a database object. When using a static resource I get the Image object. How to retrieve this Image object from a datatemplate? I though that I could use this tutorial: http://msdn.microsoft.com/en-us/library/bb613579.aspx But it does not seem to solve the problem. Could anyone suggest a solution? Thanks!

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• Element is already the child of another element.

  - by Erica

  I get the folowing error in my Silverlight application. But i cant figure out what control it is that is the problem. If i debug it don't break on anything in the code, it just fails in this framework callstack with only framework code. Is there any way to get more information on what part of a Silverlight app that is the problem in this case. Message: Sys.InvalidOperationException: ManagedRuntimeError error #4004 in control 'Xaml1': System.InvalidOperationException: Element is already the child of another element. at MS.Internal.XcpImports.CheckHResult(UInt32 hr) at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection1 collection, CValue value) at MS.Internal.XcpImports.Collection_AddDependencyObject[T](PresentationFrameworkCollection1 collection, DependencyObject value) at System.Windows.PresentationFrameworkCollection1.AddDependencyObject(DependencyObject value) at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value) at System.Windows.PresentationFrameworkCollection1.Add(T value) at System.Windows.Controls.AutoCompleteBox.OnApplyTemplate() at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)

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• How to use Win32 SetCursor() with WPF resource and HwndHost

  - by Hank

  We have an HwndHost UIElement in our WPF application which is used to display Direct3d graphics, and the only way I have found to set a cursor for the HwndHost UIElment is to call the Win32 API SetCursor(). All of our cursors are resources in managed assemblies, and I would prefer to not change that, but I have not been able to find a way to load one of these cursors via any Win32 APIs like LoadImage(). Does anybody know how to get a handle(hCursor) to a cursor which is a resource in a managed assembly? Or, is there another way to set a cursor on an HwndHost displaying Direct3D graphics?

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• Put DrawingGroup on a Canvas?

  - by stefan.at.wpf

  Hello, I have a DrawingGroup and I want to put it on a Canvas, but because DrawingGroup is no UIElement, this is not possible. Whats the best way to do this? And from which class could I derive, so that I could do something like canvas1.Children.Add(new myDrawingGroup()); (Meaning I want to add my DrawingGroup as one element on the canvas, instead of several single Drawings / Geometries. I also need hit testing and databinding support.) Thank you very much for any hint!

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• How To find the location of any treeviewitem in silverlight

  - by user312772

  Hi I am new in silverlight 3. I want to find the location of any treeview Item . Although I applied this code GeneralTransform gt = ProjectTree.TransformToVisual(Application.Current.RootVisual as UIElement); Point offset = gt.Transform(new Point(0, 0)); double controlTop = offset.Y; double controlLeft = offset.X; Here Project tree is the root element of the treeview. This code is working But when I applied this for any child TreeViewelement of Treeview then an exception occurs "Value does not fall within the expected range." How to find the location of this child treeview element object

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• Is WPF Decorator class useful?

  - by darja

  I need to create control to draw border around its child. So, I have created class and derived it from Decorator: class RoundedBoxDecorator : Decorator { protected override Size ArrangeOverride(Size arrangeSize) { //some source } protected override void OnRender(DrawingContext dc) { //some source } } It works fine, but I have some doubts about using Decorator as ancestor. I have found in MSDN that there are no special methods or properties in it, only derived from its ancestors (UIElement or FrameworkElement). ArrangeOverride and OnRender are also derived. So, what for Decorator class was designed and does it makes sense to use it? Or I can derive from FrameworkElement?

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• WPF ItemsControl - how to know when the items finished loading, so that I can focus the first one?

  - by Tomáš Kafka

  Hi everyone, I have an ItemsControl in my View, that is bound to an ObservableCollection from ViewModel. The collection is filled, and afterwards an event from VM to view is raised (think search results and SearchFinished event). I would like to move keyboard focus to the first item in an ItemsControl, but when I do it in View's code-behind when handling SearchFinished, the items are not yet rendered (the collection is filled already, but wpf's rendering is asynchronous and didn't happen yet), so there is nothing to focus (Focus() needs to have the items' visual tree already constructed). I wanted to do (myItemsControl.ItemContainerGenerator.ContainerFromIndex(0) as UIElement).Focus();, but as the 0th item is not yet loaded, ContainerFromIndex(0) returns null. I tried delaying it with Dispatcher.BeginInvoke... with low priority, but that is dependent on exact timing and usually doesn't work. How can I wait until the first item in ItemsControl is Loaded?

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• Silverlight4 Printing Question

  - by hallgato.attila

  Hello everyone! I'm having a problem with printing. Is it possible to print a (customized) DataGrid which doesn't fit the page? a) Using a ViewBox to make it fit one page. My problem here is that I can get the PrintableArea.Width and PrintableArea.Height in the PrintPage EventHandler, from the PrintPageEventArgs, but in that Event Handler I can't set the size of an UIElement before it gets printed. b) Multiple pages. Is it possible somehow to print the whole DataGrid, even the parts which are not visible (don't fit the page) and to somehow make the PrintableArea only a part of the DataGrid?

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• Binding to 'To' In Storyboard

  - by Peanut

  I'll try to make this as simple as I can. I want to do this: <Storyboard x:Name="MoveToLocation"> <DoubleAnimation Duration="0:0:0.5" To="{Binding X}" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.TranslateX)" Storyboard.TargetName="grid" d:IsOptimized="True"/> </Storyboard> As you may have noticed the Binding on 'To' Property does not work. It seems to only accept static values. How does one do this animation with MVVM? I cant just put in static data, cause it's going to change. Thanks.

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