radAjaxPanel.Alert calls the standard alert dialog. If you want to call radalert() from server-side code, you need to output JavaScript that would call this function on the client. Please check this blog post for more information on the subject.
Kind regards,
Georgi Tunev
the Telerik team
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thanks for the fast answer.
That solution resolves the problem of calling the RadAlert, but it closes a radgrid edit popup that i need to remain open.
The complete situation is that i have a radGrid inside a RadUpdatePanel and in the grid i have e popup edit form, that i make some verification and if it doesn't pass i show the RadAjaxManager Alert. but i want to change the alert window from the traditional ie window to a radwindow, as we do in the delete confirm.