Listening for events

I have three classes. Class1 instantiates class2 and class2 instantiates class3. Class1 is attached to the main movie, class2 is attached to MC2 and class3 is attached to MC3. MC2 is on the stage, and holds MC3.

When I listen for events from MC2 to MC3, I do something like this inside class2:

MC3.addEventListener(Class3.QL_MENU_OPEN, openQLMenu);

If I try to listen for the same event from the main movie, I tried something like this.

MC2.MC3.addEventListener(QuickLinks.QL_BUTTON_CLICK, traceThis);

But it did not work. How would I do this? I want to be able to listen to events in MC3 from the main movie.

Thanks a lot!