OOP - Interfaces

No, I'm not using a pattern like MVC... if I am is pure coincidence!

I'm asking this because I don't know the correct approach.

Usually I use a class to serve as a main holder. That class holdes other Class where there are custom user controllers (lists, buttons, etc)  Sometimes one controller needs to call functions from another controller (inside the main holder). When this happens I usually use:

Class MainHolder

var classA:ClassA = new ClassA();
var classB:ClassB = new ClassB();

function MyFunction():void

{

     classB.MyFunction();

}

Class A

MainHolder(parent).MyFunction(); //dostuff

Class B

function MyFunction():void

{

     //dostuff
};

Or instead I pass the functions from MainHolder to the class A ou B

Class MainHolder

var classA:ClassA = new ClassA(MyFunction);
var classB:ClassB = new ClassB();

function MyFunction():void

{

     classB.MyFunction();

}

Class A

MyFunction(); //dostuff

Class B

function MyFunction():void

{

     //dostuff
};

But I think this isn't very good because If I have a deep display list and inside Class A I have another controller witch will trigger the function, I have to create a chain passing the function to that controller too.

I'm kind lost. Can someone point me the a good way to accomplish this?