Making Component Invisible in Live Preview

This is probably ridiculously simple, but I can’t figure it out. I’m going through the Adobe Tutorial on Creating ActionScript 3.0 components by Jeff Kamerer. There is a point, which although tangential, I’m obsessing over.

In Part 2 of the tutorial, he creates a prototype before creating the actual component, and somehow, he makes a List component invisible in Live Preview. I have no idea how he is doing this, since the visible property is not editable in the property inspector. You can see his fla here. Check out the fla in the Step 3 folder.

This is probably trivial, but I have no idea how he does this. Jeff explains in a reply to a question at the bottom of this page that the Lists’ visible property are set to visible=false in the fla, but this is not done in the frame code that he’s created. His function, hideAllMenusExcept(), works, but initially all his Lists have a visible=false property, but I don’t see how he’s doing it.

Sorry for asking what is probably a really trivial question, but I can’t seem to figure it out.