[NikolyA]

http://www.adobe.com/devnet/flashpla...reen_mode.html

или так:

_root.btn_mc.onRelease = function(){
    if(Stage["displayState"] == "normal"){
        Stage["displayState"] = "fullScreen";
    }else{
        Stage["displayState"] = "normal";
    }
}
 
var listener:Object = {};
listener.onFullScreen = function(isFullscreen:Boolean){
    if(isFullscreen){
        trace("entered full-screen mode");
    }else{
        trace("exited full-screen mode");
    }
}
Stage.addListener(listener);

btn_mc - кнопка для того чтоб приложение переходило в fullscreen