Hello,
Attempted to reproduce what you are experiencing and I was unable to do so. Is there something in your code that is enabling C1Combo? What else is going on with this project besides the combo box, possibly something is triggering it not to work. Could you possibly send me the sample so I can have something that is reproducable and then I can go along with getting a fix for it.
Please let me know if there is anything else I can do for you.
Thanks,
-Steve