What you can do is check if the action clicked is to validate the userid, if so then do the validation and set the property value that is going to be shown in the UI saying "User Already Exists" or what ever the message you would like and in the OnSuccessFromFormName() method check if the button clicked was the validation button, if so then return null. This would return the page with the updated message. I think it should work, you would need to verify it though.
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