these pictures may help, that is what i want, only one state at any time.
the buttons on the right bottom is my attempt to make the one state show component.
my current applet has 4 buttons which allows learner to toggle between the 4 states of components but to turn off, need to recheck the checkboxes. (NOT what i want)
1. show component 1
2. show component 2
3. show component 3