关于日期选择器（DtPicker）获取选中的项问题

如题，日期选择器使用 dtpicker.getSelectedItems() 不能获取选中的项，直接报没有该函数。
代码如下：

var dtpicker = new mui.DtPicker({  
    type: "datetime",//设置日历初始视图模式   
    beginDate: new Date(2015, 04, 25),//设置开始日期   
    endDate: new Date(2016, 04, 25),//设置结束日期   
    labels: ['Year', 'Mon', 'Day', 'Hour', 'min'],//设置默认标签区域提示语   
    customData: {   
        h: [  
            { value: "am", text: "上午" },  
            { value: "pm", text: "下午" },  
        ]   
    }//时间/日期别名   
})  
dtpicker.show(function(e){  
    console.log(e); //Object {type: "datetime", y: Object, m: Object, d: Object, h: Object…}  
    console.log(dtpicker);  //d {ui: Object, options: Object, callback: function, __back: function, init: function…}  
    console.log(dtpicker.getSelectedItems());   //Uncaught TypeError: undefined is not a function  
})  
console.log(dtpicker.getSelectedItems());   //Uncaught TypeError: undefined is not a function