We removed a ContentTemplate DataTemplate of the Calendar button and implemented ToString() on the DataContext item passed to each button. That should be the reason for the bug but we changed both the viewmodel and the template. Can you give us exact version of the theme you are using what versions are the dlls etc. if you could provide us a small example that can reproduce the problem it would be really helpful.
Sincerely yours,
Panayot
the Telerik team
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