AS3 Getting to Control Stage - actionscript-3

Question

I am building a Flash Game, I am doing this:
MainStage, with 11 frames
Mainstage Loads > Lobby.swf (1 frame)
Lobby Loads > Arrows.swf (1 frame)
I just want to control the main Stage from Arrows.swf , get the current frame, right arrow mainStage.current frame + 1, left arrow mainStage.current frame -1
I have tried the parent/child method
this.parent.parent
parent.parent
this.root
parent.root
every combination, I am also tracing and when I finally hit the mainStage it is saying cannot convert Stage to Display Object which I understand.
but how can I just get current frame of the "mainstage" needle and control it with gotoAndPlay or other such methods ?

Answer 1

I have solved it.
I didn't control the main stage what I did was, I reduced the main stage layer in the lobby layer when I load the left and right arrow I attach an event listener for a custom event.
In the arrows movie I have written a function to dispatch the event here are the lines of code I used
in the "main" stage of the movie you want to control:
//ball loader prep and load
var ballLoader:Loader = new Loader();
var ballRequest:URLRequest = new URLRequest("lobbyBalls.swf");
ballLoader.load(ballRequest);
ballLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, ballsLoaded);
function ballsLoaded(event:Event):void{
trace("ball Loader complete");
ballLoader.x = 50;
ballLoader.y = 200;
stage.addChild(ballLoader);
ballLoader.content.addEventListener("Previous", ctrlPrevFrame);
ballLoader.content.addEventListener("Next", ctrlNextFrame);
}
In the movie from which you want to control
import flash.events.Event;
leftArrow.addEventListener(MouseEvent.CLICK, prevEvent);
rightArrow.addEventListener(MouseEvent.CLICK, nextEvent);
function prevEvent(event:Event):void{
trace("prev");
dispatchEvent(new Event("Previous", true));
}
function nextEvent(event:Event):void{
trace("next");
dispatchEvent(new Event("Next", true));
}
Thanks anyways....