//Don't scale the movie when the stage size changes
Stage.scaleMode="noScale";
 
//Align the stage to the top left
Stage.align = "TL";
 
//Function to toggle between fullscreen and normal size
//the toggle fullscreen button calls this function when pressed
function toggleFullScreen(){
  //if normal size, go to fullscreen, else go to normal size
  if(Stage["displayState"]=="normal"){
    Stage["displayState"]="fullScreen";
  }else{
    Stage["displayState"]="normal";
  }
}
//Create a listener for each time the Stage is resized
var resizeListener:Object = new Object();
//Called each time the stage is resized
resizeListener.onResize = function () {
  //Move the button to the center of the screen
  toggleFullScreenButton._x=Stage.width/2;
  toggleFullScreenButton._y=Stage.height/2;
}
//Add the listener to Stage
Stage.addListener(resizeListener);