Advofficeradiogroup Tab Behavior

Advofficeradiogroup requires to Shift-tabs to cycle to the preceding tab stop. To see what I mean, place a tbutton and a Tadvofficeradriogroup on a form. Add a few items to the radiogroup and set tabstop = true. Set the tbutton taborder to 0 and the radiogroup's taborder to 1. Run the program and press tab repeatedly. You will see the correct behavior in which each tab press advances focus from the button to the radiogroup to the button, etc. Now press shift-tab repeatedly and you will see that it takes two shift-tabs to move from the radiogroup to the button but only 1 shift-tab to move from the button to the radiogroup.