Ajax in SharePoint 2007. How to make the original message to show up?

[bin_bin1]

Hello, there, I am using Ajax in an application page in SharePoint 2007. I found that when there is an exception. Ajax will show a dialog box says " Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.", and the original exception message is not displayed. I know I can use registerpostbackcontrol() function to register the button that causes the exception to make the original SharePoint error page to show up. But I do not want to do that. Is there any other way to make the original SharePoint exception/error page to show up? Thank you very much. Best regards, Bin