Hi Steve.

When I select an item from the list, the field updates correctly, but the combo doesn't show the updated value. Sometimes I can see it, very briefly, show the value, then immediately flip back to the original value.

Hmmm. That sounds like you are calling some code from within the combo's InteractiveChange that is refreshing the combo. That would definitely cause the kind of behavior you are seeing. During the interactiveChange, the combo is beginning to update its ControlSOurce from its Value. However, if you issue a refresh here, what refresh does is to update the combo's Value from its controlSource < s >.