Free the arrow keys!;-)

Hi,
I would like to have your point of view and benefit from your experience about this;-)
I have to realize an interface that would be “keyboard only” you would navigate it with arrow keys and select with space bar for instance.
When this menu appears, the user, using the arrow keys, navigate freely through the “buttons” (I suppose that it would rather be MobieClip?).
For instance, starting from “ON”, one should be able to go right and highlight “OFF”…or go down and highlight “Option1”
The movieclip would react like a button, with different states for “highlighted”, “on” or “off”.

(I join this picture so that you can see better what’s to be achieved:
In this picture “On” & “Option2” are selected, “Off” is unselected but with an “highlighted” state, “Option1” & “Option3” are unselected)
What’s your feeling about that? What would be the best way to handle this?
Thanks very much by advance for taking of your time :wink: