Combo Boxes

I have taken to using Combo Boxes in my main form instead of using a seperate
Menu or Switchboard and I have two questions.
1. Is it possible to have the Combo Box Selection drop down when the combo
is selected as being live? I have tried all sorts bu can only have the combo
box display and the dropdowb selection become "live" when I click the small
arrow at the side. I would like it to display the options as I am offering
the selections to the user.
2. is there any way to make the combo's first item available in the list be
displayed first? What I mean here is that Combo 1 with Option 1, option 2,
option 3 etc as its selections would show option 1 in the Combo Box with
Option 1, shown again as the lead option in the drop down menu.

Any thoughts, help appreciated Thanks Ray C