Hi usr9999,
I am not quite sure if I understand your scenario correctly. If you have a client-side validation with JavaScript, you can directly call radalert() or radconfirm() (assuming that there is a RadWindowManager on that page). If we are talking about server-side validation, since radalert and radconfirm behave the same as the standard popups, you will have to output JavaScript code that would call them on the client after the postback.
Best wishes,
Georgi Tunev
the Telerik team
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