We support ClickToOpen only for root level MenuItems in RadMenu not in RadContextMenu (RadContextMenu have ClickToOpen property but it is meaningless for it).
Both RadMenu and RadContextMenu have two properties: ShowDelay
of type Duration
. Just set them to some big value (ShowDelay="1:0:0" - one hour for example) and menuitem will wait an hour before it opens its popup or you will have to click it to open the popup instantly.
Let me know if you need more information.
the Telerik team
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