1 this.dynamicPanel = new Ext.Panel({2             region: ‘center‘,3             frame: false,4             border: false,5             layout:‘fit‘,6             items:[7                 this.createDynamicPanel(‘Retailers‘)8             ]9         });

 1 createDynamicPanel:function(panelType){ 2         if(panelType==‘Retailers‘){ 3             return new Ext.ux.RetailersPanel(); 4         } 5     }, 6     onRetailersFire:function(){ 7         var dynamicPanel = this.dynamicPanel; 8         dynamicPanel.removeAll();    //移除panel中的所有元素 9         dynamicPanel.add(this.createDynamicPanel(‘Retailers‘));10         dynamicPanel.doLayout();    //重新渲染panel(Extjs4中直接添加即可,无需重新渲染)11     }