There is bug in the compiler revealed if a forward declaration of a class is reaped within a different class and that declared class is used in some templates (but in a legal way). The issue was discussed at http://social.msdn.microsoft.com/Forums/en-US/vclanguage/thread/bd2c2ad4-0377-4aea-b312-2b311ede5191.
Visual Studio/Silverlight/Tooling version
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