Keyboard focus on popup menu when not enabled system wide?

FROM : Marc Respass
DATE : Wed Aug 30 21:18:42 2006

Hi all,

I have a spec that calls for pop-up menus to be keyboard accessible. 
If the user's system does not have all Full Keyboard Access turned 
on, is it possible to make a pop-up take focus? The alternative is to 
provide a text field that auto-completes and only allows a specific 
list of items or a combo-box that only allows the list items and no 
others. I'm not even sure a combo-box can be made to allow that.

Can I force a combo-box to only allow the items in its list or can I 
make a pop-up take keyboard focus if full keyboard access is off? I 
will be using this with Core Data if that matters. If I use a combo-
box, it looks like I can implement -comboBoxSelectionDidChange: or -
comboBoxSelectionIsChanging: to prevent non-list items from
being entered but a combo-box seems so the wrong element to use.

Thanks
Marc