会Extjs大虾帮忙看看，关于GridPanel的一点问题

目前项目有个要求，就是将一条数据在一行中分两不部分现实列如:   用户名           密码
--------------------------------------------    张三            888描述：张三是个好孩子，成绩非常的不错
____________________________________________    李四            888描述：李四是个好孩子，成绩非常的不错--------------------------------------------
请大侠们帮帮我修改下下面代码....谢谢啦<script type="text/javascript">

    Ext.onReady(function(){
         var data = [
                       ["张三","888","张三是个好孩子，成绩非常的不错"],
                       ["张三","888","张三是个好孩子，成绩非常的不错"]
                    ];         var cm = new Ext.grid.ColumnModel([
            {header:"姓名",dataIndex:"name"},
            {header:"密码",dataIndex:"pwd"},
            {header:"描述",dataIndex:"desc"}
         ]);         var store = new Ext.data.SimpleStore({
              data:data,
              fields:["name","pwd","desc"]
         });         var grid = new Ext.grid.GridPanel({
              title:"test",
              cm:cm,
              store:store,
  autoHeight:true,
  viewConfig:{forceFit:true},
              renderTo:document.body
         });    });
</script>