Hello Mark,
I believe that the How to Use
RadWindow with AJAX help article will answer your questions on the way to use AJAX with the RadWindow. Let me know if you have any further questions in this regard after examining it. You may also find useful the
RadAjaxLoadingPanel control from our suite or the
UpdateProgress control from the standard AJAX suite.
Regards,
Marin Bratanov
the Telerik team
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