From Q1 2011 SP1 (0419) version of RadControls, we introduced some changes in the Selection logic of the RadTabControl. In order to be backward compatible, we also introduced the SupressSelectedContentTemplateReapplying boolean property. You can set it to true in order to get rid of the exception that occurs. We will soon have documentation article for this property. So please accept our apologies for any inconvenience caused.
the Telerik team
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