Question

I am working in silverlight.
Made a new UserControl called TextBoxWithButton.
Now i want add a new property to my new control called TextBoxBackground.

I did this :

public partial class TextBoxWithButton : UserControl
{
      public Brush TextBoxBackground
      {
           get{return textBox.Background;}
           set{textBox.Background = value;}         
      }
}

This works fine, but when I try to animate this property I get an exception.
I think it’s because TextBoxWithButton should be defined as a dependency property but I don’t know exactly how to to this.

Answer 1

You need to turn this into a Dependency Property. For details on implementing a DP, see Custom Dependency Properties.

Once you have this setup as a Dependency Property, just bind your (inner) TextBox.Background to the “local” TextBoxBackground property (in xaml). You can then animate the UserControl’s TextBoxBackground property as needed, and the “inner” property will change as well.