Could you please give us some more details about your application: how do you open the RadWindow - since the BusyIndicator is shown, the controls in it should be unaccessible. I suppose you could set the Owner of the RadWindow to be the navigation frame, so it won't open when the BusyIndicator is active.
If you could send us some code snippets, or ideally a sample project it will be very helpful for tracking down the source of the problem.
Looking forward to your reply.
the Telerik team
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