AW.UI.Combo

I've been playing with the Combo widget trying to implement a google-suggest-type control. Sad to say, I didn't get too far. Here's where I'm stuck after hours of searching through these forums and combing the source code:

1. How do I highlight text in the input box when the cotrol gets focus?

2. How can I have up&down keystrokes inside the input box move the selection in the popup?

3. How do I use a Grid instead of a List in the popup?

Thanks
D.