Hi Dave,
For Blend 3, you will be only able to consume resources that come out of dictionaries that are merged into your project from an external library.
For better design time support, you should consider the following technique (which you can use to replace your App.xaml with a differenter version, that points to the actual resource dictionary):
http://blogs.msdn.com/expression/archive/2008/04/09/creating-a-wpf-blend-project-that-loads-resources-in-code.aspxThanks,
Unni
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