TemplateBinding not working for textbox text

Question

I have a custom control called EnhancedTextBox which is a UserControl that has a TextBox and a Button. To the consumer I want it to mo

Answer 1

I figured it out after reading this MSDN about TemplateBinding. Specifically,

A TemplateBinding is an optimized form of a Binding for template scenarios, analogous to a Binding constructed with {Binding RelativeSource={RelativeSource TemplatedParent}}.

So, I decided to do this explicitly...which would allow me to set the UpdateSourceTrigger (still not sure why it doesn't default to PropertyChanged)

<TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Text, UpdateSourceTrigger=PropertyChanged}"....

And, now it is working. TemplateBinding does not even expose these properties....again, not sure why

Answer 2

You are missing the CallBack when you register the property.

Here's a sample code.

    public bool IsSelected
    {
        get { return (bool)GetValue(IsSelectedProperty); }
        set { SetValue(IsSelectedProperty, value); }
    }

    public void IsSelectedChangedCallback()
    {

        //actions when property changed

    }

    private static void OnSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        userControl.IsSelectedChangedCallback();
    }

    public static readonly DependencyProperty IsSelectedProperty = DependencyProperty.Register("IsSelected", typeof(bool), typeof(MyUserControl), new PropertyMetadata(new PropertyChangedCallback(OnSelectedChanged)));