How to get instanceName/Object from MouseEvent.target

Hello friends,

See I got three MovieClips

mcPlanet

mcPlanetOuter

mcPlanetInner

They are in the following fashion

mcPlanet

        ----->instance of mcPlanetOuter : PlanetEarthOuter_mc

        ----->instance of  mcPlanetInner : PlanetEarthInner_mc

                            ----->PlanetInner_txt(instance of  dynamic Textfield)

instance of mcPlanet :  PlanetEarth_mc.buttonMode = true

So if I move mcPlanet  both mcPlanetOuter and mcPlanetInner and the PlanetInner_txt (mcPlanetInner) should move propotionately, because all of them is under mcPlanet

I set event Target like this,

PlanetEarth_mc.addEventListener(MouseEvent.MOUSE_DOWN, startMoving);

function startMoving(EventReceived:MouseEvent):void {
    EventReceived.target.startDrag();

}

When  Mouse is down on PlanetEarth_mc, only PlanetEarthOuter_mc starts moving,  leaving  PlanetEarthInner_mc and  PlanetInner_txt in the same existing place.

I want to call the parent of the target i.e. I want to move PlanetEarth_mc.

also,

    EventReceived.target.parent.startDrag();   //Gives Error.

Plz tell me How can I achieve that from received  MouseEvent Object

I hope u understand this. Plz help me. This is my first post.

Thanks

Venkat.