Maybe you can use a different approach. You can try subscribing to the Opening event of the RadContextMenu component. Inside its handler you will be able to perform the necessary checks and decide if the menu should appear. If you need to close the menu you can simply set the e.Cancel property to True - otherwise set it to False and the menu will be visualized.
Please give this approach a try and let us know if you need any further assistance.
Pavel R. Pavlov
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