Evan, Ulises-

>>Hi all. I am building a small application for a person which is partially visually impaired. He can see only big letters so I'm building a small app with very big fonts and contrasting colors. He prefers the use of the keyboard over the mouse.
>>Is there some way to open/display a combo box by means of a keystroke, instead of clicking the mouse over the arrow?
>
>Spacebar

If your combo is a combo-combo and not a combo-list, this won't drop the list down.