I am using graph builder to map data. I want to be able to overlay the outlines of my area of interest with the existing shape file for US counties. However the best I can manage is to concatenate the two shape files and create a new combined file. While this "works", I am unable to make the AoI a different color so that it stands out. It would be great to be able to select more than one boundary from the background maps menu, and to be able to alter the properties of each separately.