Movie clip stop()

The stop() function of MovieClip class is raping my mind.
Look at this :


[Embed(source = '../../slike/helly.swf')]
var Klasa:Class;
anim = new Klasa();
addChild(anim);
anim.stop();

and the movie clip is playing.
I’ve searched the documentation and forum. It wold be really fun to know why this isn’t working. Thanks in advance.