I believe setting the Overlay property of the RadWindowManager to "True", will do the trick.
answered on 16 Aug 2010, 07:56 AM
Currently (Q2 2010) Overlay doesn't work with WebKit browsers only, because in these browsers (Chrome / Safari for example) you cannot show any HTML element over a heavy - weight object like Java applet / PDF document / Flash. If browsers' developers provide such way, we will implement it in RadWindow right away.
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the Telerik team
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