关于extjs中一个js应用另外一个js文件时出现的问题

主页面相关的a.js代码中有一个button,在button的单击事件中,我想调用另外一个b.js文件,将一个window窗口显示出来,然后我将b.js中Ext.onReady(function(){....})直接修改为function b(){....},这样在单击事件中直接调用b(),确实是可以显示了.但是b.js中的一些元素在第一次的时候还能正常显示,但是下一次点击按钮弹出框的时候就无法正常显示了.... var byWeek = {
        id:'week',
        xtype: 'fieldset',
        title: '每周几',
        hidden : true,
        height:100,
        items: [
            {
                xtype: 'radiogroup',
                id:'weekValue',
                items: [
                    {boxLabel: '周一', name: 'week-auto',inputValue:'周一'},
                    {boxLabel: '周二', name: 'week-auto',inputValue:'周二'},
                    {boxLabel: '周三', name: 'week-auto',inputValue:'周三'},
                    {boxLabel: '周四', name: 'week-auto',inputValue:'周四'},
                    {boxLabel: '周五', name: 'week-auto',inputValue:'周五'},
                    {boxLabel: '周六', name: 'week-auto',inputValue:'周六'},
                    {boxLabel: '周日', name: 'week-auto',inputValue:'周日'}
                ]
            }
        ]    }; var page2Panel = new Ext.FormPanel({
        title :'调度时间规则设定',
        frame: true,
        id:'p2',
        labelWidth: 110,
        width: 600,
        bodyStyle: 'padding:0 10px 0;',
        layout:'fit',
        autoHeight:true,
        items: [byWeek ]
});var wizardWindow = new Ext.Window({
        title : '调度规则初始化向导',
        width: 600,
        height: 400,
        border : true,
        plain : true,
        layout : 'fit',
        closeAction:'hide',
        x:300,
        y:200,
        items : [ wizardPanel],
        buttons:[
            {
                text: upText,
                id  :'last',
                handler:changePage
            },
            {
                text: nextText,
                id:'next',
                handler:changePage
            }
        ]
    });    wizardWindow.show();