Thank you for writing.
This is most likely a bug in the beta development tools. We are not doing special on our side to support vb. If we had to do this something would be wrong with the Windows Phone .NET framework. You can downgrade to a previous version of the mango tools in order to use VB, at least until the final tools are available. You can also try to reinstall the development environment. Maybe reinstalling only the Windows Phone development tools will solve the problem.
Please write again if you have other questions.
All the best,
the Telerik team
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