Tween Class to move an object called from within the object

programming flash
1

I have a custom class that I want to move with the Tween Class
I am calling the Tween constructor from within that class but when I pass the keyword “this” as the object of that constructor , it doesnt move at all the code is as follow



package{

import fl.transitions.Tween;
import flash.display.MovieClip;

public class PortViewer extends MovieClip{

var _twn:Tween;

public function PortViewer(){

    _twn = new Tween(this, "y", None.easeNone, 0, 100, 2, true);

}
}
}

how do I reference the object from within itself is there another keyword?
There are no errors it just doesnt move

Thank you Kirupa forums