Full Screen Issues

Hi, i am trying to make a Full Screen Movie and i coded the full screen like:

stage.displayState = "fullScreen";
stage.scaleMode = StageScaleMode.NO_SCALE;

When my movie starts, it shos full screen centered, but during the animation, it calls a movieclip inside with animations inside, and, while that animation is going, my movie goes to the top left of the screen, and, when stops animation, it centers again… Is there a way to solve it?

Thanks in advice…