Preventing user input in combo box values

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From: Atlas (atlaspeak_at_my-deja.com)
Date: 04/05/04 

Date: Mon, 5 Apr 2004 18:48:28 +0200

I have two combo boxes showing data from a short value list (year & month) I
don't want users to input data with the keyboard into the combo box, but
just let the user pick a value with the mouse.
I've tried the enabled and locked properties uselessly. Is there any other
property the fits my needs??