How to open the NSComboBox list programmatically

Been struggling with this all day. Perhaps I'm barking up the wrong tree.
This is the scenario: I have a database of 8,000 items, represented to the user as text. The user has to pick one. I'm thinking NSComboBox. But 8,000 items is a lot, so I want to give the user some help. The user starts typing in the combo box. I have a fairly nice search algorithm (with multiple words, typo variations, negatives etc), that allows me to reduce the list in real time as the user is typing. By the time the user has typed five or six or so characters, the list is pretty short, and I (or rather the program) whip open the combo box list, as to invite the user to pick one of the remaining items.
Most of this scheme is working, except the part where I open the ComboBox list. Yes, I know the user can hit the down arrow key. I know that, but the user perhaps doesn't.
What is the best way to open the NSComboBox list programmatically? I Googled to the best of my ability but could not find a solution.
Is it not possible? Should I be using an NSSearchField instead? Does it give me full control over the list of choices? Is it suitable in this case? NSComboBox seems more intuitive, since you are really picking and item from a list.
What are my options?
-Ron.
(I'm a novice WRT Obj-C, Cocoa, native OS X development, 30+ year software veteran otherwise)

Hi Ron -
I searched on "nscombobox open programmatically" and found this: [http://www.mail-archive.com/[email protected]/msg13021.html]. If you follow that thread backwards you'll find a solution similar to yours using CGPostKeyboardEvent. But the OP preferred the solution at the link which uses the Accessibility API. Since a documented API is usually a better choice than simulating key strokes, you might want to take a look at that page. I haven't tried either solution; was just doing some backup Googling for you.
\- Ray

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