Extending the MovieClip class

Hi guys,

I am wondering how I can add additional methods to the MovieClip class so that every MovieClip I create will have access to those methods automatically. What I mean is doing something like declaring a function “MovieClip.prototype.functionName = function()…” in ActionScript 2.0, but doing so in ActionScript 3.0 instead.

I understand that I can create a new class that extends the MovieClip class by doing “public class ClassName extends MovieClip” and write my own methods under it, but then I will need all my MovieClip symbols to implement this new class I created in order to access the methods I made. How can I achieve the effect in which I will be able to access my own methods by just having the symbol implement the MovieClip class instead of implementing a new class which extends the MovieClip class?