Hello,
Those properties have been removed in favor of new control - RadContextMenu. It has a targets collection where you specify which elements should that context menu apply to. In a word here is the equivalent of the
ContextMenuElementID property:
<telerik:RadContextMenu runat="server">
<Targets>
<telerik:ContextMenuElementTarget ElementID="someElementID" />
</Targets>
</telerik:RadContextMenu>
You can check out our context menu online examples:
http://www.telerik.com/demos/aspnet/prometheus/Menu/Examples/ContextMenu/CopyPaste/DefaultCS.aspx
Unfortunately our context menu documentation is still outdated. We will do our best to update it for the service pack.
Regards,
Albert
the Telerik team