[dba-VB] C# combo boxes

I am trying to set up a combo box bound to a field in the form such that the combo populates with 
the PKID and a text field, and when the form opens, selecting something from the combo drops the 
PKID into the field in the form.

I am not getting what to set the properties of the combo box to.  I am pulling the ID and the string 
to display into the combo but I cannot cause the combo to store the id and release control to the 
next control on the form.
-- 
John W. Colby
www.ColbyConsulting.com