Objects status that can make appear another object.

Hello everyone!

This title may be hard to understand, but I will try to make it clear.

I have a main menu, which lead to three different paths to follow. The learner choose one, when he finish it he come back to the main page to choose a second one.

When he choose a path, he clicks on a button, which with a trigger become disabled.

When he finally makes the 3 different paths, he comes back to the main page but the button dosen't show up, or there is a trigger that should make another button appear when those last three buttons are disabled. 

Do you have any idea on how to fix it? 

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