A quick update on the problem - I found the cause for this issue. When the application bar has opacity it is actually an overlay of the root frame and not part of the actual layout. This breaks our RadWindow's layout logic (RadWindow is used for the popup part of the picker).
I have fixed the bug and the fix will be available for the official Q3 2011 release - due in about two weeks.
Once again - thank you for your feedback, it really helps us build better tools.
All the best,
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>