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• Validation errors prevent the property setter being called

  - by HA

  Hi, I am looking for a simple solution to the following problem: I am using a simple TextBox control with the Text property bound to a property in the code behind. Additionally I am using a validation rule to notify the user of malformed input. ... error display style here ... …

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• Updating GUI Component from a different class C# WPF

  - by Boardy

  Hi all, I am trying to update a GUI component (DataGrid) in one class from a different class. I am using C# and WPF Forms. When I used the standard WF forms I could pass a reference to the GUI component as a parameter to the function that needed to do the work with the DataGrid. However, I do not know how I can do this in WPF. I have Class1…

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• How can I change the binding for template elements at runtime?

  - by Koynov

  I've found few solutions which assumes that I have 2 or 3 binding objects(or data templates) - that is not good solution for me. Is there an easy way to do this? I can think of cycling through the visual tree and set the binding that way but still this solution doesn't look very neat. Thank you in advance.

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• Binding one dependency property to another

  - by Gregory Dodd

  I have a custom Tab Control that I have created, but I am having an issue. I have an Editable TextBox as part of the custom TabControl View. <Controls:EditableTextControl x:Name="PageTypeName" Style="{StaticResource ResourceKey={x:Type Controls:EditableTextControl}}" Grid.Row="0" TabIndex="0" …

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• Is there any easy way to hide the radio buttons, checkboxes, etc. without hiding the content?

  - by Adam S

  I'm suspecting the answer is no, but I just want confirmation before I move on - is there any easy way (as in, not re-templating) to hide things like the box that gets checked on a CheckBox, the drop-down arrow of a combo box, etc. without hiding the actual content being displayed?

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• How to read from path in wpf comboboxitem and write into path of binding

  - by Chrik

  Hi, I tried to make up an example to show my problem. My combobox has a list of objects as itemssource. In my example it's a list of Persons. In the combobox i want to show the first name and the last name of the person. But i want to save the last name of the person in the "owner" property of the house-object. My guess was that i bind the…

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• wpf exit thread automatically when application closes

  - by toni

  Hi, I have a main wpf window and one of its controls is a user control that I have created. this user control is an analog clock and contains a thread that update hour, minute and second hands. Initially it wasn't a thread, it was a timer event that updated the hour, minutes and seconds but I have changed it to a thread because the application…

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• What's the Best Way to Navigate Silverlight XAML in Visual Studio 2008?

  - by lividsquirrel

  When editing Silverlight XAML in Visual Studio 2008, the Document Outline panel is not supported by Microsoft. 1) Any helpful tip for navigating a deep XAML markup hierarchy without the benefit of the Document Outline tool? 2) Is this supported in Visual Studio 2010?

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• How to bind a property defined as usercontrol in XAML?

  - by EricSch

  In XAML (Root is a UserControl), I have defined a grid with two columns. In a ViewModel layer, I have defined a property as UserControl. The ViewModel is set as DataContext of the XAML. How I can bind this property of type UserControl declarative to the grid? Thanks

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• Is there a way to include namespaces in xaml so I don't have to write the extension?

  - by Shimmy

  Is there a way to do 'using' in XAML i.e. declare a namespace and include it in the general xaml scope so I don't have to write namespace:Class, just Class.

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• Demystifying Silverlight Dependency Properties

  - by dwahlin

  I have the opportunity to teach a lot of people about Silverlight (amongst other technologies) and one of the topics that definitely confuses people initially is the concept of dependency properties. I confess that when I first heard about them my initial thought was “Why do we need a specialized type of property?” While you can certainly use…

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• Using data binding on value which is a FrameworkElement

  - by JaredPar

  One of my data sources produces a collection of values which are typed to the following interface public interface IData { string Name { get; } FrameworkElement VisualElement { get; } } I'd like to use data binding in WPF to display a collection of IData instances in a TabControl where the Name value becomes the header of the tab…

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• WPF MVVM ComboBox SelectedItem or SelectedValue not working

  - by cjibo

  Update After a bit of investigating. What seems to be the issue is that the SelectedValue/SelectedItem is occurring before the Item source is finished loading. If I sit in a break point and weight a few seconds it works as expected. Don't know how I'm going to get around this one. End Update I have an application using in WPF using…

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• In WPF: Children.Remove or Children.Clear doesn't free objects

  - by Bart Roozendaal

  I create some UIElements from code behind and was anticipating the garbage collection to clear up stuff. However, the objects are not free-ed at the time I expected it. I was expecting them to be freeed at RemoveAt(0), but they are only freed at the end of the program. How can I make the objects be freed when removed from the Children…

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• Clip a wpf Popup at bounds of a main window

  - by BrandonS

  From what I understand, the popup exists within it's own visual tree. However, I've noticed a few properties, Clip and ClipToBounds. What I am wanting to do is Visually clip a popup at the right and bottom edges of a window regardless of the fact that the popup is independent of the bounds of the window. I'm not using XAML, but if…

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• WPF Toolkit DataGridCell Style DataTrigger

  - by KrisTrip

  I am trying to change the color of a cell to Yellow if the value has been updated in the DataGrid. My XAML: <toolkit:DataGrid x:Name="TheGrid" ItemsSource="{Binding}" IsReadOnly="False" CanUserAddRows="False" …

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• WPF derived ComboBox SelectedValuePath issue

  - by opedog

  In our application we have a very large set of data that acts as our data dictionary for ComboBox lists, etc. This data is staticly cached and keyed off of 2 variables, so I thought it wise to write a control that derived from ComboBox and exposed the 2 keys as DPs. When those 2 keys have proper values I set the ItemsSource of…

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• WPF touch and slide/drag animation

  - by George

  I'm trying to create a pretty simple WPF interface, and from what I know this should be mostly possible using pure XAML. What I know I have a pretty basic understanding of WPF so far, however I have a decent grasp on XAML. I know or can work out how to put content in these panels. This isn't the topic of this question. What…

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• Handle exceptions with WPF and MVVM

  - by Jon Cahill

  I am attempting to build an application using WPF and the MVVM pattern. I have my Views being populated from my ViewModel purely through databinding. I want to have a central place to handle all exceptions which occur in my application so I can notify the user and log the error appropriately. I know about…

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• Wpf combobox selection change breaks Datatrigger

  - by biju

  Hi, I am trying to set the selected value of a combobox from a style trigger.It works as long as we dont manually change any value in the combobox.But it stops working altogether after manually changing the selection.How can i solve this.A sample code is attached.Please do help <Window…

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• TextBlock Wrapping in WPF Layout

  - by Joel Martinez

  Hi, I'm trying to figure out how to do something similar to the twitter silverlight app that Scott Guthrie demoed recently in WPF: http://weblogs.asp.net/scottgu/archive/2010/03/18/building-a-windows-phone-7-twitter-application-using-silverlight.aspx Unfortunately, I seem to be having a…

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• MS Chart in WPF, Setting the DataSource is not creating the Series

  - by Shaik Phakeer

  Hi All, Here I am trying to assign the datasource (using same code given in the sample application) and create a graph, only difference is i am doing it in WPF WindowsFormsHost. due to some reason the datasource is not being assigned properly and i am not able to see the series ("Series…

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• Multilingual spellcheck on WPF richtextbox

  - by sub-jp

  I need to turn spellcheck on for a richtextbox, and set the language to one the user has picked from a drop down. For now, I'm just testing it by building the richtextbox in xaml and providing a language to the xaml language attribute. I've read two different resources and one says I…

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• Wrapped WPF Control

  - by Robert

  Hi, I'm trying to create a GUI (WPF) Library where each (custom) control basically wraps an internal (third party) control. Then, I'm manually exposing each property (not all of them, but almost). In XAML the resulting control is pretty straightforward: <my:CustomButton…

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• Automatic (keyless) styles not applied when in a MergedDictionaries in another assembly

  - by Catalin DICU

  I moved the styles and templates xaml files form my application (.exe) project to a library project (.dll) because I want to use them in multiple applications. In App.xaml I have: <Application.Resources> <ResourceDictionary> …

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