I know it is asked before, but can anyone tell me how i can change the color of a fields in a grid ?

Ex.:

column 1 column2 column3 column4 column ..
name Y N N ..
.... N N Y ..
.... N N Y ..
.... Y N N ..
.... Y Y N ..

..

when in a column the value is 'Y' (true) the color should be green
when in a column the value is 'N' (false) the color should be red

How?
Or can you point me where i can find how to do it ?

Marc