On the form where they make the entries, I'm using it on the afterupdate of my combo box.
On another form, where they just view the records I'm using it on the formCurrent event. On this form, once they leave a record that has one of the values where it needs to display a tab, but then they go to a record where no tabs are visible, the tab from the previous record remains. I've tried moving this one to a couple different events and it didn't make any difference.