Ext中tabpanel中加入一个tab同时tab中包含一个grid


左边是一个动态树，点击一个叶子节点（模块），左边新增一个tab，同这个tab中包含一个grid用作显示数据。
怎么弄？
我的自己代码不行。如下：
动态树的监听。
listeners :{'click':function(node){
                              if(node.isLeaf()){
                                  tabs.remove(tabs.getComponent('item'+node.id));
                                   addTab(node.text,node.id,'grid');                                                  }else{
                                  return;
                               }
                                                                    
                           }
function addTab(title,id,uxtype){
        tabs.add({
                 id:'item'+id,
                 title: title,
                 items:[{
                       xtype:'grid',
                       stripeRows:true,
                       width:600,
                       height:800,
                       title:'模块列表',
                       store:new Ext.data.JsonStore({
                                                     url:'moduleManagerList.action',
                                                     totalProperty:'total',
                                                     root:'syModuleManager',
                                                     remoteSort: true,
                                                     fields:['moduleName','moduleCode','parentId','url','re','moduleLevel','activity','moduleId']
                                                     }),
                       columns:new Ext.grid.ColumnModel([
                                                        {header:'模块名称',dataIndex:'moduleName'},
                                                        {header:'模块CODE',dataIndex:'moduleCode'},
                                                        {header:'父模块ID',dataIndex:'parentId'},
                                                        {header:'URL',dataIndex:'url'},
                                                        {header:'备注',dataIndex:'re'},
                                                        {header:'模块级别',dataIndex:'moduleLevel'},
                                                        {header:'模块关状',dataIndex:'activity'},
                                                        {header:'模块ID',dataIndex:'moduleId'}
                                                         ]),
                       autoHeight:true
                 
                 }],
                 closable:true
          }).show();        }