Buttons in Down-State

ok… maybe this seems really easy, but I’m trying to figure out an easy way to have a series of buttons for submenus, and when clicked they stay in their down-state. Previously I’ve laid out keyframes for the amount of buttons, and broke them apart so they would be inactive and a different color. Is there some kind of function which would allow this same effect? also when another button is selected the previously inactive would return to active functionality…
does this make any sense???