Hidden button

There are various ways to set the "when..." in a trigger to change the state of a Hidden button to Normal.

• If the component-link buttons have a Visited state, the trigger could run when the State of all of those buttons = Visited. 
• Note: The Visited state has built-in functionality. If an object has a Normal state and a Visited state, it will automatically change to the Visited state when it is clicked. No trigger is needed to do that.
• Another option is to use T/F variables to track what's been viewed. For the change-button-to-Normal trigger, include conditions that check the value of those variables. 

For more information...

• This post is about controlling the NEXT button. But the same basic concepts apply to controlling any button: TIP: Controlling the NEXT Button 101 - Articulate Storyline Discussions - E-Learning Heroes 
• User Guide info about trigger conditions: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-triggers#conditions
• User Guide info about variables: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-variables