Hi Rudá,
This behavior is by design - radconfirm will be always shown centered on the page with the modal overlay covering the whole page. You cannot override this, but you could use a
RadWindow with a content template instead of the radconfirm popup. Because this is a "standard" RadWindow, it will respect the RestrictionZone.
Sincerely yours,
Georgi Tunev
the Telerik team
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