>I am trying without success to define a grid as transparent. I would like no background color. When I am doing this, setting the background as transparent for each control within the grid, it reacted by putting only the current active control transparent. When I go to another control, the transparency change to this control.
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>Is there a trick or is it something we cannot do in vfp6 ?

Try to use 'Sparse=.F.' for column. This will tell VFP that control need to be painted for EACH column. By default (Sparse=.T.) VFP paints only currect row control, other rows painted by grid as simple text using column properties.