Hi,
Sorry for the inconvenience.
It is possible that the Telerik Visual Studio Extensions are old or have not upgraded properly. Can you please verify that their version is 2011.3.1219?
The version can be found in
Visual Studio | Tools | Extension Manager | Telerik Silverlight VSExtensions.
Hope we get the issue resolved soon.
Greetings,
Teodor
the Telerik team
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