We are not aware of such a failure. It is possible that you have missed to add an assembly reference or you have added the wrong version of the controls. There are different versions built for WPF 3.5 and WPF 4.0 and you should choose the one that matches the target framework version of your project. You can refer to this article for a list of the assembly references required by the control.
Please, let us know how it goes.
the Telerik team
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