Locked Menu - help

Hi heroes,

Hoping someone can give me some direction on creating a locked menu in Storyline 2. I'm trying to set four menu buttons to be restricted in order for the learner to progress from one section to the next in order - I wanted to have the first button to be normal when starting, and the next three disabled. Then, once the first section was reviewed and upon returning to the menu, the second button would change from disabled to normal, and the firs button would be visited, this would continue until all buttons showed visited. At that time the next button with a message to click it would be made available to end the course. I've added what I've tried so far. I've tried numerous iterations of this and keep hitting roadblocks. Any assistance is appreciated!