How can i get a view position from an another meditator class?

Question

My startup command is:

var containerView:ContainerView = new ContainerView();
var sampleView:SampleView = new SampleView();

contextView.addChild(containerView);
contextView.addChild(sampleView);

containerView.y = 50;
containerView.x = 250;

SampleMediator:

[Inject]
public var containerView:ContainerView;

trace(containerView.x); //0

Main:

public class Main extends Context
{
    public function Main(contextView:DisplayObjectContainer)
    {
        super(contextView);
    }

    override public function startup():void
    {
        commandMap.mapEvent(ContextEvent.STARTUP_COMPLETE, StartupCommand, ContextEvent, true);

        injector.mapSingleton(SampleView);

        mediatorMap.mapView(ContainerView, ContainerMediator);
        mediatorMap.mapView(SampleView, SampleMediator);

        super.startup();
    }
}

So how can find exact position of containerView in another class? Everytime it returns 0.