map to buttons

When in the map to section I notice that if you click nor, disp, etc it goes on but a second makes it do something else. What happens on the second click
anyone know? A third click turns off the button.


the second click makes it do it backwards; e.g- for nor, the first click might make it seem like an indentation, but the other way around would make it seem as if its coming out of the object.