You cannot attach to an event when using a collection editor. You can do this only from the property grid pane. To do this, show the property grid pane and then select a menu item by navigating to the drop-down list of the property grid. Then select the events page in the property grid. There you will find listed all events supported by RadMenuItem
I hope this helps. If you need further assistance, do not hesitate to contact us.
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download
; also available is the Q2'11 Roadmap
for Telerik Windows Forms controls.