Hello Chandan,
RadWindow is based on an IFRAME and behaves just like one. If the encrypted Url can be opened in an IFRAME (by setting the src property), it can be opened in RadWindow as well. The RadWindow controls itself does not modify the Url in any way - it is simply a container that loads a content page, different from the parent one.
Kind regards,
Georgi Tunev
the Telerik team
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