Hi, Al,
I have approved the request for introducing ReadOnly mode in RadMultiColumnComboBox.
Currently, the possible solution that I can suggest is to cancel its EditorControl.CurrentRowChanging event.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik
Love the Telerik and Kendo UI products and believe more people should try them? Invite a fellow developer to become a Progress customer and each of you can get a $50 Amazon gift voucher.