Add button Event

Hi,

I'm using SAP B1 2005 A SP1 PL18 with B1DE

I'd like to clear some fields on a form linked to UserDataSources when I press the Add button on the application button bar.

Currently when I press the add button, all controlls linked to DBDataSources are cleared, but my controlls linked to UserDataSources are not cleared and still show their "previous" values.

Which event should I be triggering on to clear out the old values for the UserDataSources when the user clicks the Add button?

.Ben