[flexcoders] Accessing the main class

[ACasualObserver]

I am creating an AS3 application. The mail file has some thing like this:

package {
        import ...;
        public class myClass extends Sprite
        {
                public function svg()
                {
                }
        }
}

I also have other classes that will be created by myClass or other
classes. Is there anyway that I can calls methods in myClass? In other
word, is myClass instance globally available?

Thanks