After simply adding a RadContextMenu to a RadGridView and performing a rigfht click we get this:
An unhandled exception ('Unhandled Error in Silverlight Application Code: 4004
Category: ManagedRuntimeError
Message: System.ArgumentException: Value does not fall within expected range
HELP!
<telerik:RadContextMenu.ContextMenu>
<telerik:RadContextMenu x:Name="cmParameters">
<telerik:RadMenuItem Header="Add Condition Set" Name="cmParameters_AddCondSet" />
<telerik:RadMenuItem Header="View/Edit Condition Set" Name="cmParameters_ViewEditCondSet" />
<telerik:RadMenuItem Header="Delete Condition Set" Name="cmParameters_DeleteCondSet" />
<telerik:RadSeparator />
<telerik:RadMenuItem Header="Copy Condition Set" Name="cmParameters_CopyCondSet" />
<telerik:RadMenuItem Header="Paste Condition Set" Name="cmParameters_PasteCondSet" />
</telerik:RadContextMenu>
</telerik:RadContextMenu.ContextMenu>