Navigation without mouse

I have a swf that I’d like to navigate with keyboard arrows to access each active button.

(a) navigating through ‘hit state’ buttons on a menu page using arrow keys
(b) a highlight_mc that remains on the focus item.

In the same swf I also have key press methods in place.

I feel like this is an easy issue, but maybe some input form a PRO could unlodge my thinking.

Thank you!