To advanced for me auto-refreshing combobox

Hi, well, the title of my post should say it all…
I need a combobox that auto-refresh content depending on what the user type.
Example if I type “a”, it displays the list of choice starting by a… like below.
[color=navy]typing “a”[/color]
alain
alternative
azoummm
…,
[color=navy]typing “al”[/color]
alain
alternative

Since nobody’s answering my question, I continued developping it, it works, but after I repopulated the combobox, I’ve lost the cursor. I tried with Selection.setFocus on the combo, did’nt work.

How to position the cursor at the end of the editable field, and expand the combo list upon frefreshing…

HARD to answer, I know…
Thanks a lot