Mike
I don't think you can achieve this, but if you want a different back-color depending on a specific condition, there is a trick.
You can put two controls one on top of the other, with their respective back-colors, and in the "print-when" clause in both of them enter the respective conditions.

HTH
Jaime

>Can you set the back-color property on the detail line field programmatically at run time? If so please explain...