Ext3.2.2 分页工具条如何隐藏刷新按钮

var grid = new Ext.grid.GridPane({

bodyStyle:'width:100%',
store: store,
columns: columns,
stripeRows: true,
autoScroll:true,
bbar:new Ext.PagingToolbar1({
//.........
onFirstLayout : function(){//增加这个配置就可以了
if(this.dsLoaded){
this.onLoad.apply(this, this.dsLoaded);
}
if(this.rendered && this.refresh){
this.refresh.hide();
}
}
//......
})

//....
})