3 Replies
Jerry Beaucaire

1) Create a TRUE/FALSE variable to store the status of the other scene's completion (Section1Done)

2) Create a trigger on the final slide of that section somewhere to set this variable to TRUE (Section1Done = True)

3) Back on your main menu, add a trigger to change the state of the button to the color/state you want based on that variable being set to TRUE.  

This will probably have to be a TIMELINE STARTS trigger, and you'll need to set this slide to "Reset To Initial State" when revisiting.  This will cause any triggers you've set for "timeline starts" to be reevaluated each time you return to the main menu and they will have effect you want.