UIPropertyMetadata not found

09-28-2008 9:26 PM |

When a create a dependency property and call DependencyProperty.Register I tried to use the following: 

public static readonly DependencyProperty ImageSourceProperty =

DependencyProperty.Register("ImageSource", typeof(string), typeof(ImageButton), new UIPropertyMetadata(""));

 However, I get an error in both VS2008 and Blend that UIPropertyMetadata could not be found. Does UIPropertyMetadata not exist anymore?

 Exact error message is and I do have System.Windows as a using statement.  

The type or namespace 'UIPropertyMetadata' could not be found (are you missing a using directive or an assembly reference?)