项目需要，在一个swf文件中要实现三种大功能，为了方便管理，写了三个类文件，但是flash中设置文档类貌似只有一个，因此用以下方法实现。      flash文件：main.fla；      主类文件：main.as;      功能类文件：ahello.as，bhello.as，chello.as;            flash文件里设置文档类main.as。            main.as代码：package{    import flash.display.MovieClip;    import flash.display.Sprite;    public class main extends MovieClip    {        private var canvas:Sprite;        public function main():void        {            init();        }        private function init():void        {             build();        }        private function build():void        {            canvas = new Sprite();            this.addChild(canvas);            var a:ahello = new ahello();            var b:bhello = new bhello();            var c:chello = new chello();            canvas.addChild(a);            canvas.addChild(b);            canvas.addChild(c);        }    }}      ahello.as代码：package{    import flash.display.MovieClip;    public class ahello  extends MovieClip    {        public function ahello():void        {            trace(“a”);        }    }}      其他几个功能类文件以此类推：）      这样就能在一个fla中管理多个as类文件了。      这样abc都各自作为一个子对象加载到主文件里，不用时卸载子对象即可，需要时加载。

      设置ComboBox中列表的样式：      CSS代码：.ComboBoxStyle{    drop-down-style-name:MyStyle;}.MyStyle{    background-image:Embed(source=’style/swf/chatStyle.swf’,symbol=’listComponent’);    border-style:none;}