Issue in accessing stage objects from Class file

Hello…

i have an issue in accessing stage objects from class files.

Here is my code

package
{
import flash.display.MovieClip;
import flash.events.*;
import AS3Player;

public class thumbClass extends MovieClip
{
    public function thumbClass()
    {
        trace("helloworld")
        var AS3Player1:AS3Player = new AS3Player();
        addChild(AS3Player1);
        AS3Player1.thumb1.addEventListener(MouseEvent.CLICK,load1);
        function load1(e:MouseEvent):void
        {
            trace("sdadasasd");
        }

    }
}

}

here i have thumb1 in fla file and i am not able to add a listener on it.
Any help regarding it would be appreciable.

Thanks
Nikhil