Glad you figured it out
I would have used the after update event. I don't think the on change event is doing what you think.... but if it works, what do I know???
The change event fires every time you press a key. So if you try typing a "Sire" name, say "Seattle Slew", the change event fires 12 times.
Try this. Ensure the form header is displayed. Enter this line in the change event for the combo box"
Code:
Me.FormHeader.BackColor = Not (Me.FormHeader.BackColor)
Then type in a "Sire" or "Dam" name.
If you never use autocomplete and only select names using the list, never mind.
And if I didn't understand, ignore the above.