You should first create a RadPane and place the TabControl in it:
<telerik:RadPaneGroup>
<telerik:RadPaneHeader="testPane">
<telerik:RadTabControl>
<telerik:RadTabItemHeader="test"/>
<telerik:RadTabItemHeader="test2"/>
</telerik:RadTabControl>
</telerik:RadPane>
</telerik:RadPaneGroup>
Best wishes,
Yana
the Telerik team
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