Please, check that the project you have created is against a non-Client Profile version of the framework. By default, VS2010 created new WinForms project under .NET4 Client Profile
, which we do not support in Q1 2010. If you change the project to be against .NET4 the controls should appear in the toolbox. Let us know whether this was the case.
FYI, we will support the Client Profile versions of .NET4 and .NET3.5 in the upcoming SP.
the Telerik team
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