Hi Dan,
Do you use RadWindow for ASP.NET (RadWindow 1.x) or RadWindow for ASP.NET AJAX?
If you work with RadWIndow 1.x, you could use the following JavaScript code to avoid the problem (make sure that it is placed after RadWindowManager's declaration:
If this doesn't help or you are using a recent version of the control (RadWindow for ASP.NET AJAX), please provide the exact version of the control that you are using along with a code of a simple page where the problem could be reproduced so we could investigate further.
Kind regards,
Georgi Tunev
the Telerik team
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