Visited state when section completed

Hello, 

I want to create a visited state on the buttons on my contents page '1.2 Welcome', for when a section is completed. Each section has more than 1 slide, and includes a quiz....

So I want the visited state to occur when all the slides in that section have been viewed, and the quiz has been taken. 

I'm fairly new to Articulate Storyline, but assume I would have to set up some variables?

I have attached the project. 

Thanks, 

Jon


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