Gaz is correct about the properties for the combo box.
But that's going to impact the data in the text box. The Control Source for the text box needs to be a field from your lookup table (as opposed to the field that contains the id to your lookup table in the Record Source for the form).
To get the value you want in the text box you have several options:
1) make your Record Source for the form be a query that includes the description field from the lookup table and make the Control Source for the text box be that description field. -OR-
2) Set the Control Source for the text box to
=(Select DescFld from LookupTable Where IdFld = me.comboboxname).
Or you can use
=DLookup("DescFld","LookupTable","IDFld = " & me.comboboxname)
3) Set the Control Source of the text box to use the data in the combo box. I'm not sure of this syntax, but something like:
Hopefully that will cover everything.
Randall J Weers
Membership Vice President
Pacific NorthWest Access Developers Group