How to Expose a DependencyProperty of a Control nested in a UserControl?

Question

I\'m trying to bind an Image down from a Window into a UserControl \'Display\' thats inside a UserControl \'DisplayHandler\'. Display has a DependancyProperty \'DisplayImage

Answer 1

The AddOwner solution should be working, but you have to add a PropertyChangedCallback that updates the embedded control.

public partial class DisplayHandler : UserControl
{
    public static readonly DependencyProperty DisplayImageProperty =
        Display.DisplayImageProperty.AddOwner(typeof(DisplayHandler),
            new FrameworkPropertyMetadata(DisplayImagePropertyChanged));

    public HImage DisplayImage
    {
        get { return (Image)GetValue(DisplayImageProperty); }
        set { SetValue(DisplayImageProperty, value); }
    }

    private static void DisplayImagePropertyChanged(
        DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        var dh = obj as DisplayHandler;
        dh.display1.DisplayImage = e.NewValue as HImage;
    }
}