Пример

Код:
class Man extends MovieClip {
private var __mc:Man;
function Man (mc:MovieClip) {
mc.__proto__ = Man.prototype;
__mc = Man (mc);
trace (this)
}
public function drawBox (w:Number, h:Number) {
this = __mc;
lineStyle (0, 0);
lineTo (w, 0);
lineTo (w, h);
lineTo (0, h);
lineTo (0, 0);
}
}

Код:
var mc = new Man (this.createEmptyMovieClip ("mc", 0));
mc.drawBox (100, 300);