When focus is within DatePicker, TAB can be used to loop through the controls (month arrows, year arrows, date) but when using SHIFT-TAB to loop the opposite direction, the focus gets stuck at the date and will not continue the loop.

To reproduce:
1. Bring up HelloDatePicker (java -cp Hello.jar hello.HelloDatePicker)
2. Press TAB until focus is on DatePicker.
3. Press F4 to open DatePicker calendar.
4. Press TAB continually to loop around controls within calendar, can loop without problem.
5. Press SHIFT-TAB to loop around the controls in the opposite direction.
6. Focus will get stuck at the calendar date, and will not continue looping.

RULE tests/jaws/DatePicker any any
RULE tests/narrator/DatePicker any any
RULE tests/voiceover/DatePicker any any