adding a new color all depends on how the game handles the grid. If the grid isnt meant to scroll then you have the issue of it going off screen. In theory you would still be able to select but not able to see it.
Edit: This might effect the grid
Store_common_color_grid:draw_items(Color_grid_data, 1, 9, 1, 53.5, 53.5, 15, nil, 1.1, true, true, -7, true)
Edit: This might effect the grid
Store_common_color_grid:draw_items(Color_grid_data, 1, 9, 1, 53.5, 53.5, 15, nil, 1.1, true, true, -7, true)