Prev and Next button appear after revisit the quiz.

I know this is an old thread.. but if anyone is still listening, I'm wondering how to set a trigger for that Next button that appears by default when revisiting a quiz slide.

I've got a scene that has a series of quiz questions. You access that scene from a main menu slide in another scene. And at the end of the quiz questions, I want users to be able to return to that main menu slide again. This works fine first time through... the Continue button has a trigger that returns them to the main menu slide. 

If they revisit the Quiz scene, they can review each of their questions/answers, clicking Next to go from question to question. This is fine. But when they get to the last question, the Next button doesn't do anything. And there is no way to add a trigger to the Next button on that slide to send it back to the main menu slide... because the Next button was turned off for all of the quiz questions.  It's only showing up because it is the default behavior in Storyline, as noted above.

As a possible solution, is there a way to add a button on that last slide that will only display when the quiz question is being revisited? And then I could add a trigger to that button?

Thanks for any help here.