Hi,
You can inject a script from the code-behind that will close the RadWindow. More details about doing this are available in the following help article:
http://www.telerik.com/help/aspnet-ajax/radwindow-troubleshooting-javascript-from-server-side.html. You will most likely need to traverse the Page controls tree to get the RadWindow object and its ClientID which you need for the $find() call. Since you are calling the script from a user control the syntax that will most likely work well for you is the following:
which assumes the contents of the RadWnidow use Ajax and do not dispose the entire page.
Kind regards,
Marin
the Telerik team
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