[mx] combobox, focus & keypad arrows

[chartrandi]

Hi,
I'm using an mx combobox component. It works perfectly fine until...

after the user has made his/her selection, the combobox closes.
Then, if the users clicks on "UP" or "DOWN" on the keypad, the value
in the combobox changes. I understand that's normal behavior for when the combobox is open, but now how can I prevent that behavior from working when the combobox is closed?

I do have a textbox below the combobox, so if it's just a matter of focus ...perhaps I could do something like

(when the user _releases_ the mouse button in the combobox), set focus out and put the focus into the textbox instead. But I'm not sure how to go about and doing that.

help