Referencing Resource Dictionaries in a separate project

Referencing Resource Dictionaries in a separate project

I've recently split my silverlight application into several smaller projects.

I've moved all of the resource dictionaries containing my styles into a separate project ("Application.Themes") I then reference these from my App.xaml file within my main project.

This works fine for the main project however all other projects that reference styles within these resource dictionaries throw "Object Reference not set to an instance of an object" exceptions within the designer, although they do compile and run without any problems and with the correct styles.

I've added an App.xaml file to each of the individual projects which references the same dictionaries as my main App.xaml file, this has made no difference.

Is there a correct way to reference resource dictionaries from another project which allows the designer to be used?

Answers & Comments...

---