Flash 加载夹as2未加载swf

有人能帮我弄清楚为什么这个不会加载到我的swf中吗？我没有错

var my_mcl:MovieClipLoader = new MovieClipLoader();//Used to load the image

button1_mc.onPress = function()
{
my_mcl.loadClip(B.swf,container_mc);//loading a movie into a container movie clip (just an empty mc on the stage)
trace("a")
};

button2_mc.onPress = function()
{
my_mcl.loadClip(B.swf,container_mc);//loading a movie into a container movie clip (just an     empty mc on the stage)
    trace("b")
};

var mclListener:Object = new Object();
my_mcl.addListener(mclListener);

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我唯一能看到的是，您的代码中存在一个问题，即您要加载的SWF的URL应该用双引号括起来：

my_mcl.loadClip("B.swf", container_mc);