Setting specific background color to Row-cloumn.

I am reading this forum and got a lots of help. Thanks to all participants.
Through the code posted in this forum, I am able to set background color for an individual column and an individual row but I would like to set background color to specific row-column combination.
What I meant is, suppose I have a grid of 4 X 3 ( row X col).
I want to set

Yellow color to grid 1 X 1, 1 X 2 and 1 X 3 ( first row in all three columns)
blue color to grid 2 X 1, 3 X 1 and 4 X 1 ( first column except first row)
red color to grid 2 X 2, 3 X 2 and 4 X 2
green color to grid 2 X 3, 3 X 3 and 4 X 3

Could some one help me to establish background color to above scenario
Thanks
Syed

Have any one answere to it.

Check the source code in /examples/grid/cell colors.htm. You should change myColor function to return the desired color and assign it to the background (instead of the text color).