Yes, RadMenu can be integrated as a context menu with various controls which expose the necessary client event on which to show the menu. Here is a couple of examples:http://www.telerik.com/demos/aspnet/Controls/Examples/Integration/TreeviewAndMenu/DefaultCS.aspx?product=treeviewhttp://www.telerik.com/demos/aspnet/Controls/Examples/Integration/GridAndMenu/DefaultCS.aspx?product=grid
However, RadScheduler does not have an event which captures the context click (right-click) on the client. You can consider the OnClientAppointmentClick event, but in this case the menu will be shown on left-click.
I have logged a feature request for OnClientContextClick event for RadScheduler and our developers will consider implementing it in the future.
the Telerik team