Siverlight 2 do not support RightMouseButtonDown. There is no right mouse button support.
However you can open the context menu on right click if you enable windowless
property on the silverlight plug-in. Please keep in mind that this way you will see both menus - default silverlight context menu and RadContextMenu. Also while in windowless
mode your application performance may suffer greatly.
I hope this helps. Let me know if you need more information.
the Telerik team
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