如何获取flash中所有按钮的数量？

flash要从xml中读取数据， 
我想要判断当按钮实例名称等于xml的一个节点名称时，设置这个按钮的onPress地址为xml中该节点的url值。 
可是不知道如何对所有按钮进行循环，想要获取所有按钮的数量来控制循环
flash代码如下
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var myXML = new XML();
myXML.load("maplist.xml");
myXML.ignoreWhite = true;
myXML.onLoad = function(success) {
  if (success) {
    trace("XML加载成功！");
    readXML();
    //分析XML文件的函数
  } else {
    trace("XML加载失败！");
  }
};
function readXML() {  
  for(var i=0;i< ildNodes.length;i++){
    //trace(i);
    var re1 =  ildNodes[i]. 
      trace(re1);
      cc = "pacifica";
    if(re1 == cc ){
      trace(re1);
      var clen =  ildNodes[i].childNodes.length;
      var continent =  ildNodes[i];
      trace(continent);
      trace(clen);
      //var con1= ildNodes[i];
        for(var j=0;j<clen;j++){
          var country =  ildNodes[j];
          //trace(country);
          //break;
          var bname = Button._name;
          var cname =  ;
          var curl =  tributes.url;
          //trace(cname);trace(curl);
          if(bname == cname){
           bname.onPress = function  () {//实例名称为a1的按钮当按下时调用的函数
                   getURL(curl);//链接地址 
           trace(cname);
           trace(curl);
           trace(country.youchu);
            }
          }
      }
    }
  }
}
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xml文件如下：
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<?xml version="1.0" encoding="UTF-8"?>
<worldmap>
<continent name="pacifica">
<country name="china" url=" " youchu="234" youchan="345" qichu="23432" qichan="877" youhao="432" qihao="398" />
<country name="australia" url="333" youchu="234" youchan="345" qichu="23432" qichan="877" youhao="432" qihao="3948" />
<country name="234" url="333" youchu="2234" youchan="345" qichu="23432" qichan="877" youhao="5432" qihao="398" />
<country name="fffew" url="333" youchu="234" youchan="345" qichu="23432" qichan="877" youhao="4352" qihao="398" />
<country name="hxd" url="334" youchu="2323" youchan="345" qichu="23432" qichan="877" youhao="4232" qihao="398" />
</coutinent>
</worldmap>
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