Storyline: Disabling next button until user has clicked through activity

Hi all! The activity I constructed asks students to click through a series of rectangles to reveal either a check mark or an X. The way the triggers are constructed, when the student clicks a given rectangle it is triggered to change the state of the respective answer. How do I disable the Next button until students have clicked through all of the rectangles? Is there an easy way to force students to click through the rectangles in order (there are 15 of them)? That way I could trigger the next button to change its state to normal once the final rectangle has been clicked. Thank you for any suggestions!

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