I have the Q1 2010 SP2 controls. When I drag the RadGridView to the desin surface of a control I get a "cannot find type Telerik.Windows.Data.Record in module Telerik.Windows.Data.dll." Previously I was getting a differen error which I continue to get for other controls (such as the RadGroupHeader) "Unspecified error (Exception fromk HRESULT: 0x80004005 (E_FAIL))".