chrome浏览器-Toolbar工具条不显示

Ext.require(['Ext.form.Panel','Ext.Toolbar']);
Ext.application({
name: 'MyApp',
icon: 'images/icon.png',
glossOnIcon: false,
phoneStartupScreen: 'images/phone_startup.png',
tabletStartupScreen: 'images/tablet_startup.png',

launch: function(){
var myToolbar = Ext.create('Ext.Toolbar',{
id: 'mytoolbar',
docked: 'top',
items:[{
ui: 'action',
text: '按钮一'
},{
ui: 'confirm-round',
text: '按钮二'
},{
ui: 'decline',
text: '按钮三'
},{
ui: 'decline-small',
text: '按钮四'
}]
});

var myPanel = Ext.create('Ext.Panel',{
id: 'mypanel',
itmes: [myToolbar],
html: '测试面板'
});

Ext.Viewport.add(myPanel);
}
});