Hi Raheel Ashraf,
You are correct that when a radWindow is modal, it resets the focus by using a small timeout of 10ms /this is not the case with non modal RadWindow, it does not change focus at all and no timeout is used there so it is not correct to say that the default close handler uses a timeout /. Since there is only the 10ms timeout, using 30ms should be safe enough and we have also not been contacted with reports for problems with that.
the Telerik team
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