TemplateBinding doesn't bind to effect's property?
binding, effects, templates, wpf
Solution
If it is obvious, it is not to me :-)
My favorite book (WPF Unleashed) mentions that sometimes TemplatedBinding doesn't work (but the enumerated reasons don't match your circumstances).
But TemplatedBinding is a shortcut for:
{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TestValue}
I reproduced your case, i.e. changing TestValue only has effect on the button. After replacing the TemplatedBinding by this, I get the desired effect.
Problem
Imagine a control named Testko like this: ``` public class Testko: Control { public static readonly DependencyProperty TestValueProperty; static Testko() { DefaultStyleKeyProperty.OverrideMetadata(typeof(Testko), new FrameworkPropertyMetadata(typeof(Testko))); TestValueProperty = DependencyProperty.Register("TestValue", typeof(double), typeof(Testko), new UIPropertyMetadata((double)1)); } public double TestValue { get { return (double)GetValue(TestValueProperty); } set { SetValue(TestValueProperty, value); } } } ``` Nothing fancy, just an empty control with a single double property with a default value set to (double)1. Now, image a generic style like this: ``` <Style TargetType="{x:Type local:Testko}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:Testko}"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <StackPanel Orientation="Vertical"> <StackPanel.Effect> <BlurEffect Radius="{TemplateBinding TestValue}" /> </StackPanel.Effect> <Button Content="{TemplateBinding TestValue}" Margin="4" /> </StackPanel> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> ``` Now, the problem is that Radius property is never bound for some reason. Wheras Button's content is properly bound to TestValue property. I am sure I am missing something obvious. Or not?