extjs this.ownerCt.title和this.ownerCt.ownerCt.title IE都报对象不支持此属性或方法

Question

Ext.onReady(
function() {
var _window = new Ext.Window({
renderTo:Ext.getBody(),
title:"登录窗体",
layout:"form",
width:250,
plain:true,
items:[{
xtype:"textfield",
fieldLabel:"name"
},{
xtype:"textfield",
fieldLabel:"password"
}],
buttons:[{
text:"ok",
handler:function() {
alert(this.findParentByType("window").title);
alert(this.ownerCt.ownerCt.title);
alert(this.ownerCt.items.itemAt(1).getValue());
}

            },{
                text:"cancel"
            }]
        });

        _window.show(); 

    });

Answer 1

extjs版本? :o :o :o