使用state做air启动画面

老是分不轻mx:window nativeWindow  mx:windowApplication nativeApplication的关系
<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" 
	windowComplete="init()" showFlexChrome="false" visible="true" 
	verticalScrollPolicy="off" 
	horizontalScrollPolicy="off"
	 layout="vertical">
	
	<mx:Script>
		<![CDATA[
			import flash.utils.setTimeout;
			private function init():void{
//				this.nativeApplication.x=
				setTimeout(closeSplash,3000);
			}
			private function splashInit(event:Event):void{
				this.splash.x = Screen.mainScreen.visibleBounds.width/2 - this.width/2;
				this.splash.y = Screen.mainScreen.visibleBounds.height/2 - this.height/2;
				this.splash.visible=true;
			}
			private function closeSplash():void{
				this.setStyle("showFlexChrome",true);
				this.currentState="login";
			}
		]]>
	</mx:Script>
	<mx:Window id="splash" 
		width="496" height="260"
		windowComplete="splashInit(event)" 
		showFlexChrome="false"
		visible="false" 
		verticalScrollPolicy="off"
		horizontalScrollPolicy="off">
		<mx:Canvas>
			<mx:Image source="assert/splash.png" id="simage"/>
		</mx:Canvas>
	</mx:Window>
	<mx:states>
		<mx:State name="login">
			<mx:AddChild>
				<mx:Panel width="100" height="100" >
					
				</mx:Panel>
			</mx:AddChild>
			<mx:RemoveChild target="{this.splash}">
				
			</mx:RemoveChild>
		</mx:State>
	</mx:states>
</mx:WindowedApplication>

 app.xml

<!-- The type of system chrome to use (either "standard" or "none"). Optional. Default standard. -->
        <systemChrome>none</systemChrome>

        <!-- Whether the window is transparent. Only applicable when systemChrome is false. Optional. Default false. -->
        <transparent>true</transparent>