AS3 Class problem

Hi all!

I am trying to learn working with multiple classes in AS3. I came across a problem which I can not solve or look up. I have searched the documentation but I can not find a clear sollution or answer.

I have flashfile with a document class (main class). Within this class I use another class (circle class) to get a instance of a movieclip on the stage.

Now my problem is that I can not place the eventlisteners to the circle class. normally I would write something like this.addEventListener() but this doesnt work. But I really need a way to get this to work, because I want to make a mouse click event which must be linked to the circle to respond to it.

How someone can clear things out!