Thank you for contacting us.
Could you please give us some more details about your application: where is the RadMenu, how you are using the RadWindow. Sending us detailed information, so that we can reproduce the issue will be very helpful. Feel free to send us a sample project in which we can observe the issue. In that way we will be able to provide you with a solution in a timely manner.
Looking forward to your reply.
the Telerik team
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