LPARAMETERS mtwup1,cmat_type,mzedit cmat_type=ALLTRIM(cmat_type) DO CASE CASE EMPTY(mtwup1) and !medit mcolour=rgb(224,224,218) CASE !EMPTY(mtwup1) and cmat_type="Dry" mcolour=RGB(0,255,0) CASE !EMPTY(mtwup1) and cmat_type="Blend" mcolour=RGB(255,255,255) CASE !EMPTY(mtwup1) and cmat_type="UV" mcolour=RGB(255,100,0) OTHERWISE mcolour=rgb(80,80,80) ENDCASE RETURN mcolour * 1) Grey for empty field * 2) Green for full not blend * 3) Brown for full Blend * 4) Blue for UVGetting the error "Data type is invalid for this property" when I call from the grids Init Method: