关于PagingMemoryProxy（）一次读取XML中数据问题

Question

                var myReader=new Ext.data.XmlReader({
                     totalRecords:"results",
                         record:"row",
                         id:'id'
                         },MyRecord);
                
                                var myProxy=new Ext.data.HttpProxy({
                                url: 'xml/cxspxml.xml',        
                        failure:function()
                        {
                             Ext.Msg.alert("提示","下载数据失败");
                     }
                });                var mystore=new Ext.data.Store({
                proxy:myProxy,                
                                reader:myReader
                });本地XML内容：  
  
<?xml version="1.0" encoding="gb2312" ?> 
- <table name="cxsp">
- <row>
  <st_pro_id type="200">AA3XM000K0201002 M1</st_pro_id> 
  <pro_name type="200">男式硫化鞋</pro_name> 
  <pro_class type="200">XM</pro_class> 
  <pro_style_id type="200">男式低帮硫化鞋</pro_style_id> 
  <pro_goods_style type="200">AXMJ3A004</pro_goods_style> 
  <pro_color2 type="200">002</pro_color2> 
  <pro_size2 type="200">41</pro_size2> 
  <pro_price_normal type="131">199</pro_price_normal> 
  <st_on_hand_qty type="131">1</st_on_hand_qty> 
  </row>
  </table>
              
我原来的目的就是像静态读取数据一样，利用 proxy:PagingMemoryProxy（data）一次读取XML中数据。然后分页，我用了 proxy:PagingMemoryProxy（myProxy）发现读取不了，求正解~