Flex里加载SWF,并控制其播放

Code
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" >
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            private var mc:MovieClip;

            private function init():void
            {
                mc = swf.content as MovieClip;
            }
            private function prev(evt:MouseEvent):void
            {
                if (mc.currentFrame>1)
                {
                    mc.gotoAndStop(mc.currentFrame-1);
                }
            }
            private function next(evt:MouseEvent):void
            {
                mc = swf.content as MovieClip;
                if (mc.currentFrame<mc.framesLoaded)
                {
                    mc.gotoAndStop(mc.currentFrame+1);
                }
            }
        ]]>
    </mx:Script>
    <mx:SWFLoader id="swf" source="assets\test.swf" complete="init()">
    </mx:SWFLoader>
    <mx:Canvas id="cav" backgroundColor="#FFB5B5" backgroundAlpha="0.1">
    </mx:Canvas>
    <mx:Button x="603" y="10" label="上一页" fontSize="12" click="prev(event)"/>
    <mx:Button x="603" y="40" label="下一页" fontSize="12" click="next(event)"/>
    <mx:Label x="603" y="72" fontSize="12" id="lblCount"/>
    <mx:Button x="603" y="100" label="Button"/>
</mx:Application>