Thanks, but I have tried that. When I use the actual name of the submit button in the login control, I get an error: The TargetControlID of 'ModalPopupExtender' is not valid. A control with ID 'LoginImageButton' could not be found.
In other words the ModalPopupExtender cant even see the login button inside the login control.
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by: sjors1309Posted on 2008-06-02 at 15:05:26ID: 21696090
Try not using a client side name for TargetControlID in asp markup (server code). Just state the controlname (serverside) of the control that you want to associate the extender with being just LoginImageButton and let ASP.Net create the correct names for you