新手请教

Question

用EXT做的前台，PHP做得后台做得是一个表格，现在问题就是我查询了之后想要刷新GRID表格，用FIREBUG看的，数据已经返回了，但是GRID表格没有刷新
function search(){
Ext.QuickTips.init();                                                             //跳出窗口
    var searchform=new Ext.form.FormPanel({
labelWidth:100,                               //标签宽度
frame:true,
border:false,
width:300,
height:100,
labelSeparator:':',                           //分隔符
items:[
({fieldLabel:'请选择查询类型',name:'searchtype',allowBlank:false,editable:false,
     xtype:'combo',
     width:250,
     mode:'local',
     triggerAction:'all',
         selectOnFocus:true,
     store:new Ext.data.SimpleStore({
 fields:['value','name'],
data:[['id','按ID查询'],['title','按标题查询'],['url','按URL查询'],['ending','按处理查询'],['findtime','按发现时间查询'],['deletetime','按删除时间查询'],['personatype','按人员类型查询'],['deletetype','按方式查询']]
}),
valueField:'value',
    displayField:'name',
    emptyText:'请选择查询类型'
}),
new Ext.form.TextField({fieldLabel:'请输入相应信息',width:250,name:'searchterm',allowBlank:false})        ],
buttons:[                              //提交按钮
    new Ext.Button({
        text:'提交',
handler:function refersearch(){
searchform.form.submit({
url:"operations.php?action=search",
method:'POST',
success:function(){
                     wins.hide();},
                    failure:function(){Ext.Msg.alert('提示','查询操作记录失败！');}});
}                  //提交查询操作记录
}),
 new Ext.Button({
        text:'重置',
handler:function reset(){searchform.form.reset();}             //重置输入
}),
    new Ext.Button({
        text:'关闭',                   //隐藏弹出窗口
handler:function(){
wins.hide();
}
}) ]});var wins=new Ext.Window({                  //创建弹出窗口
layout:'fit',
title:'查询记录',
width:400,
closeAction:'hide',
height:150,
resizable:false,
shadow:true,
modal:true,
closeable:true,
//bodyStyle:'padding:5 5 5 5',         //不知道什么作用的玩意
animCollapse:true,
items:[searchform]
});
    wins.show();}
这是查询的方法reload也不行啊