Change cell color if stock-level is 0

Hello!

We are a couple of students who are struggling with a problem in Axapta 4.0.

We want a cell to change color if the stock level for that item is 0. How can we achieve this? I've googled around and managed to change color on a row (by overriding displayoption() for that table), but what we need is to change the color ONLY when stock-level is 0. I guess we need some kind of if-statement?

Please help us with this, it's urgent! =)