EXT3.3.1在IE9上 , TreePanel click event 失效

EXT3.3.1在IE9上 , TreePanel click event 失效var treePanel = new Ext.tree.TreePanel({
        id:'treePanel_'+(menuIndex++),//让菜单id可控
      title: title,
      lines:true,
      autoScroll:true,
      rootVisible:false,//控制是否显示树根节点
      loader: new Ext.tree.TreeLoader({
            preloadChildren: true,
            clearOnLoad: false
        }),
      root:new Ext.tree.AsyncTreeNode({
        text:'treeRoot',
            expanded:true,
            children:menuConfig
     }),
     listeners: {
            click: function(n,e) {                alert(1);
                //menuJumpMethod(n,e);
            }
     }
    })大家有解决办法不？