I'm blaming this on Trump

Have a form that I have added a bunch of labels, text boxes, and combo boxes to.

Working fine, happy with life, then my Trump election moment!!!!

Added an additional combo box which I want to be tab indexed as 3.

Went to the View->Tab Order option and manually clicked through the order I want things to be addressed 0, 1, 2 ,3 etc.

My new combo box however is still getting accessed as the last control on the form rather than the fourth one

Am I not doing something.

Please note this is a project that has been dropped in my lap, original coder has resigned and headed further north, and I haven't touched this stuff since the VB6 days.