It is a big step that you understand me but the biggest step will be if I will understand you.
1. Your new code giving me the error message (Expression is invalid...) as yesterday.
2. To be more clear I created a method with name 'rowcolor', the syntax is something like this:

lpara gridfield
local lnColor
do case
   case gridfield.column(i).value='NEG'
      lnColor = rgb( 255, 0, 0 )
   case gridfield.column(i).value='POS' OR gridfield.value='AFF'
      lnColor = rgb( 0, 255, 0 )
   otherwise
      lnColor = rgb( 0, 0, 0 )
endcase
return lnColor

3. How can I use with your solution (for i to column count) and with this methd and it's will work?
Thank you