Use an External ResourceDictionary in a WindowsPhone 7 app

Question

I am trying to create an ResourceFile Called DataTemplate.xaml in an external dll and use that in a WP7 page. When I do the following in the header of my Page I get an erro

Answer 1

Silverlight doesn't support pack URIs. It's a WPF feature.

If you examine the type of the Source property for the Image object in Silverlight it is Uri. But in WPF the source is a dependency property with a type of ImageSource.