Targeting movieclip on stage from inside a movieclip

Here’s my problem:

On the stage I have a movieclip called mc_back. I also have a movieclip on the stage called mc_content. Now, inside mc_content I have a bunch of code and some of it adds, or should add, an EventListener to mc_back as well as a a function that works when mc_back is pressed.

So basically, all code is written inside mc_content and some of it needs to interact with mc_back.

I can’t for the life of me figure out how to target mc_back from inside mc_content. Using stage.mc_back or root.mc_back doesn’t work and Google should be my friend, but in this particular problem, it’s acting more like my enemy.

Hope you can help me out, thank you!