Extjs 触发事件有关问题 _JavaScript

Extjs 触发事件问题
//树
var store = new Ext.data.TreeStore({
root: {
children: [
{
text: "root",
expanded: true,
children: [{
text: "工资管理",
//展开
//expanded: true,
children: [{
text:"book",
//叶子节点
leaf:true,
// handler: function(){
// alert("adsfsdf");
// loadPage(this.text,'page/fucking.jsp');
// }
listeners:{
click:function(){
alert("adfasdf");
loadPage(this.text,'page/fucking.jsp');
}
}
},{
text:"fucking",
leaf:true
}]},{
text: "员工管理",
children:[{
text:"alegrbra",
leaf:true
}]}
] },
{ text: "buy lottery tickets", leaf: true }
]
}
});
//树的panel
var tree=new Ext.tree.Panel({
width: 150,
height:window.screen.availHeight,
store: store,
border:0,
rootVisible: false
});

当我点击节点的时候并没有事件发生,这是为什么?我这样写对吗？

------解决方案--------------------
把click事件放到外层，是treepanel的事件

JScript code

var store = new Ext.data.TreeStore({
    listeners: {
          click: function() {
              alert("adfasdf");
              loadPage(this.text, 'page/fucking.jsp');
          }
      },
    root: {
        children: [
  {
      text: "root",
      expanded: true,
      children: [{
          text: "工资管理",
          //展开
          //expanded: true,
          children: [{
              text: "book",
              //叶子节点
              leaf: true,
              //     handler: function(){
              //     alert("adsfsdf");
              // loadPage(this.text,'page/fucking.jsp');
              // }
          }, {
              text: "fucking",
              leaf: true
}]
          }, {
              text: "员工管理",
              children: [{
                  text: "alegrbra",
                  leaf: true
}]
              }
  ]
          },
  { text: "buy lottery tickets", leaf: true }
  ]
    }
});
//树的panel
var tree = new Ext.tree.Panel({
    width: 150,
    height: window.screen.availHeight,
    store: store,
    border: 0,
    rootVisible: false
});

------解决方案--------------------

itemclick:{}

------解决方案--------------------
API有各种方法，没API，不然大家咋知道这些方法。