Thank you for your question.
This is a little tricky as there is no official way to exit a Windows phone application, because supposedly you don't need to. One trick for this is to throw an unhandled exception. However, what the Diagnostics component does is, to "handle" the unhandled exception and prevent the application from exiting, so this would not help in this case. If you set the Diagnostics' HandleUnhandledException property to false, the application will quit, when an exception is thrown, but you will not get a chance to send the report. We will continue evaluating our options here and try to improve the behavior in this scenario with our next release, which is coming next month.
the Telerik team
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