Thank you for contacting us.
What you're saying sounds really strange. I suppose that this may be some assembly mismatch in your project. You may try to clean the solution, delete the Bin and Obj directories in the solution folder, verify that the correct assemblies are referenced and rebuild. If this does not help, could you please tell us what is the version of the assemblies that you reference (Right click the assembly, then Properties
and then check Version
I am looking forward to your reply.
the Telerik team
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