Hi Rupa,
You should handle RadWindow2's OnClientClose client-side event and invoke
RadWindow1's setActive client-side method.
You can find more about RadWindow client-side events in the following online example:
http://demos.telerik.com/aspnet-ajax/window/examples/clientsideevents/defaultcs.aspx?product=window
More about RadWindow's client-side API is available here:
http://www.telerik.com/help/aspnet-ajax/window_programmingradwindowmethods.html
Greetings,
Petio Petkov
the Telerik team
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