Try ALT + Arrow down.

>I'm trying to create a mouseless interface for order entry.
>
>If I have a combobox with style = 2 (listbox mode), hitting the space bar opens up the list. Great!
>
>If style = 1, hitting the space bar enters a space into the combo's edit box, as it should. But I'd still like to have a way to open up the listbox with the keyboard. I've experimented around, I cannot find any key that works in this situation. Is there one?
>
>If no, is there a way for me to open up the list programmatically. For example, in this case, since a space is not a valid character, I could programmatically trigger on receipt of space (when combobox has focus) and (theoretically) force the list open with the appropriate action...whatever that is.