Optimal Interfaces

I’m fairly new to AS3. Mainly, the largest barrier was transitioning game screens on individual frames to placing each graphic through code on a single frame when needed (which from what I’ve heard, is the “right” way to do it).

I’ve begun work on an RPG and was wondering if, for example, I was laying down graphics for a Main Menu, should I just make it 100% transparent when you leave, or removeChild then addChild when they return to it? Which would be most optimal?