I think this is what you are looking for. I pulled this from the Microsoft KB #Q130458.

Place the following code in the grid's INIT event:
PUBLIC grno
grno = RECNO()
THIS.setall("Dynamicbackcolor", ;
"IIF(RECNO()=grno,RGB(64,128,128),RGB(255,255,255))","Column")

Place the following code in the grid's AfterRowColChange event:
LPARAMETERS nColIndex
grno = RECNO()
THIS.Refresh()

This will change the row to a green background.