ProductGridPanel 那个rowselect的事件那样用会照成死循环吗

见一下代码 那个rowselect的事件那样用会照成死循环吗

/********创建FormPanel*******/
ProductFormPanel = Ext.extend(Ext.form.FormPanel,{
	constructor:function(){
		ProductFormPanel.superclass.constructor.call(this,
			{
				labelWidth:45,
				defaultType:'textfield',
				defaults:{anchor:'90%'},
				baseCls:'x-plain',
				items:[
					{fieldLabel:'姓名',name:'name'},
					{fieldLabel:'年龄',name:'age'},
					{
						fieldLabel:'性别',
						hiddenName:'sex',
						xtype:'combo',
						mode:'local',
						displayField:'sex',
						readOnly:true,
						triggerAction:'all',
						value:'男',
						store:new Ext.data.SimpleStore({
							fields:['sex'],
							data:[['男'],['女']]
						})
					}
				]
			})
	},
	reset:function(){
		this.getForm().reset();
	},
	getValue:function(){
		if(this.getForm().isValid()){
			return new Ext.data.Record(this.getForm().getValues());
		}else{
			throw Error('表单未能通过！');
		}
	},
	setValue:function(_r){
		this.getForm().loadRecord(_r);
		
	}
});
/*******创建Windows*********/
ProductWindows = Ext.extend(Ext.Window,{
	form: new ProductFormPanel(),
	constructor:function(){
		this.form = new ProductFormPanel();
		 ProductWindows.superclass.constructor.call(this,
			{
				plain:true,
				width:300,
				modal:true,
				items:this.form,
				closeAction:'hide',
				buttons:[
				{
					text:'确定',
					handler:this.onSubmitClick,
					scope:this
				},
				{
					text:'取消',
					handler:this.onCancelClick,
					scope:this
				}]
			}
		 );
		 this.addEvents('submit');
	},
	close:function(){
		this.form.reset();
		this.hide();
	},
	onCancelClick:function(){
		this.close();
	},
	onSubmitClick:function(){
		try{
			
			this.fireEvent('submit',this,this.form.getValue());
			this.close();
		}catch(_err){
			return;
		}
	}
});
/*******创建InsertWin*******/
InsertProductWin = Ext.extend(ProductWindows,{
	title:'添加产品'
});
/*******创建UpdateWin*******/
UpdateProductWin = Ext.extend(ProductWindows,{
	load:function(_r){this.form.setValue(_r);},
	title:'修改产品'
});
/*******创建GridPanel*******/
var data = [{name:'张三',sex:'男',age:18},{name:'李四',sex:'女',age:20}];
var store = new Ext.data.JsonStore({
	data:data,
	autoLoad:true,
	fields:['name','age','sex']
});
var cm = new Ext.grid.ColumnModel([
{dataIndex:'name',header:'姓名',sortable:true},
{dataIndex:'sex',header:'性别',sortable:true},
{dataIndex:'age',header:'年龄',sortable:true}
]);
ProductGridPanel = Ext.extend(Ext.grid.GridPanel,{
	insertwin:new InsertProductWin(),
	updatewin:new UpdateProductWin(),
	constructor:function(){
		ProductGridPanel.superclass.constructor.call(this,{
			cm:cm,
			region:'center',
			height:300,
			store:store,
			border:false,
//这个地方这样用是死循环了吗
			sm:new Ext.grid.RowSelectionModel({
				 singleSelect:true,
				 listeners:{
				 	'rowselect':{
				 		fn:function(_sel,_index,_r){this.fireEvent('rowselect',_r)},
				 		scope:this
				 	}
				 }
			}),
			title:'测试',
			tbar:[
				{
					text:'添加记录',
					handler:function(){this.insertwin.show();},
					scope:this
				},
				'-',
				{
					text:'修改记录',
					handler:function(){
//								this.updatewin.show();
//								var r = this.getSelected();
								try{
									this.updatewin.show();
										this.updatewin.load(this.getSelected());
								}catch(_err){
									alert(_err.description);
								}
							},
					scope:this
				}]
		}),
		this.insertwin.on('submit',this.onInsertWinSubmit,this);
		this.addEvents('rowselect');
	},
	getSelected:function(){
			var _sm = this.getSelectionModel();
			if(_sm.getCount()==0)
			{
				throw Error('请选择一条记录！');
			}
			return _sm.getSelected();
		},
	onRowSelect:function(_sel,_index,_r){
			this.fireEvent('rowselect',_r);
		},
	insert:function(_r){
			alert(Ext.util.JSON.encode(_r));
		
			this.getStore().add(_r);
		},
	onInsertWinSubmit:function(_win,_r){
			
			this.insert(_r);
	}
});


Ext.onReady(function(){
	var grid = new ProductGridPanel();
	var view = new Ext.Viewport({
		renderTo:Ext.getBody(),
		items:[grid]
	});
});

如何能把ToolBar也封装成一个类呀！