Extjs多個tab頁面——panel層疊

Ext.define('YieldApp.view.YieldBottomView' ,{     extend: 'Ext.panel.Panel',     alias : 'widget.yieldbottomView',     autoHeight : true,     region: "center",     border: false,     frame: true,     autoWidth: true,     title: '産量統計分析清單',          items: [{                          xtype: 'tabpanel',                          region: 'center',                          id : 'yieldBottomPanel',                          defaults: {                             autoScroll: true,    //是否有滾動條                             bodyPadding: 5                          },                          items: [                             {                                 xtype: 'panel',                                 id : 'pmonth',                                 title: '按月份統計',                                 items: [{xtype : 'yieldmonthListView'}]                             },                                                         {                                 xtype: 'panel',                                 title: '按季度統計',                                 items: [{xtype : 'yieldcountListView'}]                             },                             {                                 xtype: 'panel',                                 title: '日産值統計',                                 items: [{xtype : 'yielddayListView'}]                             }                                                  ]                      }] });