Combo box question(Urgent Please)

Hi friends,
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I have a combo box called LstSalesReps.
I have five items in it
1)Allan
2)Steve
3)John
4)Dave
5)Tim

The SalesReps Dave and Tim are not active now but i do NOT want to remove them from the combo box.
I want to show the SalesReps Dave and Tim in different color or different font or anything of that sort which differentiates Dave and Tim from the rest of them in the combo box.
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Hope you understand my question.

Please reply soon.
Thanks,
Srini