RadioButton keyboard navigation does not work as expected

Steps to reproduce:
1. Run attached SWFs or compile and run attached mxml
2. Tab to RadioButtons and attempt to navigate between buttons using left and right keys.

Actual Results:
With build 3494, keyboard navigation works as it has previously, right arrow causes selection to go down, left arrow causes selection to go up. Selection does not wrap around, i.e. if at the top, up arrow does not select the button button.

Starting with build 3498, the behavior of keyboard navigation with radio buttons changes and does not work as expected. Right arrow no longer causes selection to go down. Left arrow causes selection to wrap and then go up. Right arrow causes selection to go down, wrap around, but middle button is never selected using right arrow.

Expected Results:

Workaround (if any):