Ext4.0叶子节点事件响应

Question

Ext老版本可以这么弄 
var root = new Ext.tree.AsyncTreeNode({
        text: '',
        draggable:false//是否允许拖拽
    });

           
           
  mzgh = root.appendChild(new Ext.tree.TreeNode({
id:"mzgh",
icon:"imgs/application_form_edit.png",
text:"ABCD"
}));
mzgh.on("click", function(){
         obj = Ext.getCmp('centerTabPanel');
        var tab = Ext.getCmp('regpanel');
if(tab){
obj.activate(tab);
delete tab;
delete obj;
return;
}
    else {
                var p = obj.add(new Neo.frontdesk.Regpanel({
title:'gh'
,id:'regpanel'
,closable:true
})
);
obj.activate(p);
delete p;
delete obj;
    }
       });
Ext4.0要怎么弄才能实现这功能？？？求助！！！！Ext4.0叶子节点事件响应ext4ExtJS

Answer 1

还实现个什么功能啊，点击？拖拽？右键菜单？