In the HelloToggleButton sample, Tab/Shift-Tab cannot change the ToggleButton focus if either ToggleButton is checked.

Reproducible: always
   
Steps to reproduce:
0. Screen Reader does not need to be on for this issue.
1. Execute ToggleButton demo: java -cp Hello.jar hello.HelloToggleButton
2. Press Up Arrow key a few times. Whichever Button the focus ends upon, it will be checked.
3. Press Tab.

Expected result: Focus moves to other ToggleButton and checks it.
Actual result: Focus does not move.

Tab will work if you uncheck both buttons with the spacebar (or mouse).

ADDITIONAL NOTE: This sample needs at least 3 ToggleButtons in order to properly test Tab/Shift-Tab (the tester can observe the direction of the Tabbing loop).

RULE tests/jaws/ToggleButton any any
RULE tests/narrator/ToggleButton any any
RULE tests/voiceover/ToggleButton any any