Controlling states in Articulate Storyline 2

Let's say I have two shapes on the screen. Both are set to NORMAL state when the timeline starts.

If a user selects shape A, tt changes to a SELECTED state.

If they select it again, it goes back to the NORMAL state.

Is there a way to set a trigger or condition so that the user can only make the decision one time?

in other words, if I click Shape A, the state is SELECTED. If I try to click it again, the SELECTED state is maintained?

I have about 9 shapes on a screen and want the user to have to stick to their first choice (either selecting the shape or not).. I don't want them to be able to toggle back and forth. 

Thanks my fellow Storyliners 

4 Replies