On Database Error property
This is where you can specify a list of methods that must be called in case of database errors. For example:
MessageInformation(A database error has occurred, please contact Systems Management)
You can also specify if database errors are to be reported on the screen or not, by setting the Show RDBMS Errors Deployment Configuration parameter in the Authorizer.
You can set this property by choosing File, Edit Application from the Windows Designer menu bar.