You do that when you bind the control to the field. So open a blank
instance of the form in design mode, select the control, right-click it
and pull up the properties, find where you set the value and look at
one of the back tabs of the bindery.
Basically, it's just [prop1] + [prop2] where those are the two properties on the item that you're trying to add.
--
Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers