ATLAS ConfirmButton control comes with the ATLAS Control
Toolkit. The purpose of the ConfirmButton is to simply give the user a
confirmation message with choices "OK" and "Cancel". Now, if you press "OK"
a postback will happen which kinda breaks the ATLAS rules of NO POSTBACK. On the
other hand you can put the the ConfirmButton inside the UpdatePanel and it will
be rendered without any POSTBACK.
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