extjs代码执行不完全

 var   tb = new Ext.Toolbar({
                    items:[
                        {iconAlign: 'left',text: ' 放大',iconCls:'zoomin',height:20,width:60,enableToggle:true,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 缩小',iconCls:'zoomout',height:20,width:60,enableToggle:true,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 平移',iconCls:'pan',height:20,width:60,enableToggle:true,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 全图',iconCls:'fullextent',height:20,width:60,enableToggle:false,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 距离量算',iconCls:'juliliangsuan',height:20,width:80,enableToggle:true,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 面积量算',iconCls:'extent',height:20,width:60,enableToggle:true,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 导航',iconCls:'query',height:20,width:60,enableToggle:false,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 打印',iconCls:'print',height:20,width:60,enableToggle:false,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 鹰眼',iconCls:'yingyan',height:20,width:60,enableToggle:true,handler:maptoolclick},
                        {iconAlign: 'left',text: ' 清除',iconCls:'clear',height:20,width:60,enableToggle:true,handler:maptoolclick}
                    ]
            });
            alert(1);
            Ext.onReady(function(){
                Ext.state.Manager.setProvider(new Ext.state.CookieProvider());
                  alert(2);
                tb.render('tools');
               alert(3);
这个页面能单独打开你用刷新
当我把这个页面放在mainframe中和topframe一块儿是执行弹出1，2，刷新也不起作用，必须鼠标放在地址栏然后回车整体页面才能显示出来，这是怎么回事