Disable Fixed style

I would like to hide fixed lines for Fixed Columns.

(legacy app using version 6.14)

See grid.Options : goFixedHorzLine, goFixedVertLine

Thanks!
I forgot these properties.

I have a background picture, with

  BackGround.Display := bdTile;
  BackGround.Cells := bcAll;
And I wanted to totally remove the grid lines, while doing custom drawing in the cells.
It was possible with a (very) ancien version of the grid.

I manage to do it with a custom hack of BaseGrid.pas - procedure PaintCellInt()
with GridLineWidth = 0 and BackGround.Display := bdFixed
May be there is a cleaner way to do it...

//  if gdFixed in AState then
//  begin
//    //Inflaterect(ARect,-1,-1)
//    ARect.Right := ARect.Right - 1;
//    ARect.Bottom := ARect.Bottom - 2;
//  end
//  else
//    Inflaterect(ARect, -FGridLineWidth, -FGridLineWidth);

  ARect.Left  := ARect.Left - 1; 
  ARect.Top  := ARect.Top - 1; 
  ARect.Right   := ARect.Right - FGridLineWidth;
  ARect.Bottom := ARect.Bottom - FGridLineWidth;