panel能正常显示,就是里面的柱状图显示不出来 源码如下var store = new Ext.data.JsonStore({
fields:['name','visits','views'],
data:[
  {name:'Jul 07',visits:245000,views:3000000},
  {name:'Aug 07',visits:245000,views:3500000},
  {name:'Sep 07',visits:355000,views:4000000}
 ]
   });var form = new Ext.Panel({
title:'产品分析',
renderTo:'form',
width:500,
height:300,
layout:'fit',
items:{
xtype:'columnchart',
url:'../resources/charts.swf',
store:store,
xField:'name',
yField:'visits',
listeners:{
itemclick:function(o){
var rec = store.getAt(o.index);
Ext.example.msg('Item Selected','You chose{0}.',rec.get('name'));
}
}
}
 });