You haven't indicated what problem you are encountering. Your reference to two color maps hints that you are having getting the two to come out with the colors you want.
Contour plots are a hggroup object that has children that are patch objects. You can change the color properties of the patch objects. The only real trick that have found is that in order to switch between filled and non-filled, you have to change a property in the hggroup object that is the parent of the patch objects.