Compare your code to mine! When you ask for one color, you get one color!!!! And that's what you have done!

thisform.grd1.column2.DynamicBackColor='iif(field='xxx',RGB(255,64,64),RGB(255 ,255 ,255 ))' 
thisform.grd1.column2.SPARSE=.F.
thisform.grd1.refresh()

Please note that this is ALL the code you need in the command button. And don't change the first line, except for other color values!

>For to understund I added a command butoon on the form, on the click event, I added the following code:

>select crsrgrd
>scan
>	if alltrim(crsrgrd.field)='xxx'
>		thisform.grd1.column2.dynamicbackcolor='rgb(125,112,23)'
>		thisform.grd1.column2.SPARSE=.F.
>		thisform.grd1.refresh()
>	endif
>endscan

>When I click all the column color changed.