在FLEX中的stage以及全屏相关内容

现在我们先看看代码,下面的代码装在creationComplete事件中调用init()来启动全屏.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute"
creationComplete="init()"
>
<mx:Script>
<![CDATA[
private function init():void{
stage.displayState = StageDisplayState.FULL_SCREEN;
}
]]>
</mx:Script>
</mx:Application>
现在保存运行一下swf,却有TypeError..详细信息如下
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Main Thread (Suspended: TypeError: Error #1009: 无法访问空对象引用的属性或方法。)    
    swf_fullscreen/init    
    swf_fullscreen/___swf_fullscreen_Application1_creationComplete     
    flash.events::EventDispatcher/dispatchEventFunction [no source]     
    flash.events::EventDispatcher/dispatchEvent [no source]     
    mx.core::UIComponent/dispatchEvent     
    mx.core::UIComponent/set initialized     
    mx.managers::LayoutManager/doPhasedInstantiation    
Function/http://adobe.com/AS3/2006/builtin::apply [no source]  
    mx.core::UIComponent/callLaterDispatcher2     
    mx.core::UIComponent/callLaterDispatcher    
Main Thread (Suspended: TypeError: Error #1009: 无法访问空对象引用的属性或方法。)   swf_fullscreen/init   swf_fullscreen/___swf_fullscreen_Application1_creationComplete   flash.events::EventDispatcher/dispatchEventFunction [no source]   flash.events::EventDispatcher/dispatchEvent [no source]   mx.core::UIComponent/dispatchEvent   mx.core::UIComponent/set