Puzzle - Dynamically change data template control from another data template
- by Burt
I have a DataTemplate that contains an Expander with a border in the header. I want the header border to have round corners when collapsed and straight bottom corners when expanded. What would best practice be for achieving this (bonus points for code samples as I am new to XAML)?
This is the template that holds the expander:
<DataTemplate x:Key="A">
<StackPanel>
<Expander Name="ProjectExpander" Header="{Binding .}" HeaderTemplate="{StaticResource B}" >
<StackPanel>
<Border CornerRadius="0,0,2,2">
This is the expander datatemplate:
<DataTemplate x:Key="B">
<Border x:Name="ProjectExpanderHeader"
CornerRadius="{Binding local:ItemUserControl.ProjectHeaderBorderRadius, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}}"
Background="{StaticResource ItemGradient}"
HorizontalAlignment="{Binding HorizontalAlignment,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}},
Mode=OneWayToSource}">
<local:ItemContentsUserControl Height="30"/>
</Border>
</DataTemplate>
