Hello,
If you are opening the RadWindow from a server-side event you need to make sure you inject the script properly for use in an AJAX environment. How to do this is shown here:
http://www.telerik.com/community/forums/aspnet-ajax/window/opening-radwindow-from-the-server.aspx. On using the OpenerElementID property - you need to set it in the code-behind, as shown here:
http://demos.telerik.com/aspnet-ajax/window/examples/openandposition/defaultcs.aspx.
Kind regards,
Marin Bratanov
the Telerik team
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