This can be set up in Value list setup. Filemaker doesn't provide all the options you'd see in an MS Access combo box but this one can be done.
Define a value list with the specify field option so that tblStates::StateID is listed in field 1 and tblStates::State is listed in field 2. "Specify show only values from field 2."
If you use this value list with the pop up menu option, you have what you describe.
This can also be approximated with a drop down list, but it takes a bit of creativity to manage it so that the number stays hidden and the state text is visible after you exit the field.
Going a bit crazy trying to duplicate the combo box ...!!
Am presently uncertain of the difference between a drop down list and a pop up menu.
Much appreciated if you'd elaborate, or point me to a clarifying link.
Well, you can only do an Access-style combo box with a pop-up menu. It won't work with a drop down list.
A pop-up menu only allows entry of the values in the value list (unless you've checked the "Allow editing.." or "Allow other..." options). With a drop down list, you can type your own values directly into the field.
*With a pop-up menu (as with a checkbox or radio button) users can still *paste* values into the field control. A major flaw in my opinion.