Add new methods to MovieClip class?


Is there any way to add methods to the existing MovieClip class so that later I can use them everytime I instantiate a MovieClip? Something like this:

package {
    import flash.display.MovieClip;
    public class myClass extends MovieClip {
       public function myMethod() {
         //do stuff

Then, without instantiating myClass, I want to be able to call that method like this:

var newMc:MovieClip = new MovieClip();

Is it possible?