AW.UI.Combo keypress input like a <select>

I've been searching through the forum trying to find a working example of how we make AW.UI.Combo work with keyboard input. For example, I have a list of items in the popup such as the states of the U.S. I want to press the N key until NC is selected. It will first hit NB, then I want to press it again to move on to NC. A third press would go to ND.

Of course, the popup needs to show the presently selected item.

I've seen some example code for this in the forum, but can't seem to locate it for the past few days.

As always, your assistance is appreciated!