Understanding Color Mapping
Color mapping is the process of assigning highlight colors with transparency values to
the colors used in an overlay. The colors you assign can be different for each of the three
button states (normal, selected, and activated).
You can use two types of overlays: a simple one that uses a single overlay color and an
advanced one that uses up to four overlay colors. For many menus, a simple overlay will
provide what you need with minimal complexity. You may find, however, that an advanced
overlay provides greater flexibility when you are creating complicated menus.