When using Maptools with a map that already has a grid (like the amazing KOTS map Ashrem Bayle put together at http://www.enworld.org/forum/showthread.php?t=227731), how do you go about placing tokens to line up with the grid on the map image as opposed to the grid within Maptools? I've tried resizing the Maptools grid to align, but it doesnt quite work...can you disable the Maptools grid?