This is not possible in Access. You can only change the background colors for the entire control, not for a row. You can change the background colors of rows in a report, for example, but not within any control (list, combo, etc.)
Your option would be to create your own group of controls and use conditional formatting on each one, and allow them to act as a list box, but this would take some coding.
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mmcdonal
Look it up at:
http://wrox.books24x7.com