For when the built in tick box object just doesn't do what you want.
This active object is a wannabe tick box. He just loves being clicked and changing his status. He can tell you if he is ticked or not straight through Flag 1! Of course, if he gets a bit too much to handle, you can just disable him by turning Flag 2 on.
Commented and customizable.
Edit: Strangely, i didn't actually bother checking which colour was which in the example frame. So the wrong colour objects start moving. This is a simple careless error and the example should still be pretty clear!