I have my buttons disabled until the audio is complete. Then they click the button, go to a section, come back to the slide with all the buttons and they change to visited. However, I have recently had someone click on the visited state. Since there are quiz questions in different button sections, the program freezes. I would like to be able to make the visited states disable so they can't be clicked again. Since they are disabled in the beginning, how do I make this happen? Two different disable states?