Print and manage symbols Problem

Hi all. I faced up a problem. I have a mc which I duplicate with AS, there are also buttons to add and remove instances of this mc. I store mc instances into a sprite container. But when I create my file I set up some values in pixels. The problem with all of this is how to make the stage grow with the mc instances. When I start the movie and I start creating mc they are visible till one moment when they are not. How to cope with this, because I want to print these mc instances. 10x in advance :)

I can't figure out how to do this