选择日期后，我无法从Ajax日历控件中读取日期

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/Calendar/Calendar.aspx

我没有收到任何错误，但无法从文本框中获取任何值。

public static void main(String[] args) throws InterruptedException {

        WebDriver driver = new FirefoxDriver();
        driver.get("http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/Calendar/Calendar.aspx");
        driver.manage().window().maximize();


        //Default calendar: 
        driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_Date1']")).click();

        for(int i=0;i<=5;i++){

            for(int j = 0;j<=6;j++){

                System.out.print(driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_defaultCalendarExtender_day_"+i+"_"+j+"']")).getText()+"-");

            }
            System.out.println();
        }

        driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_defaultCalendarExtender_day_3_4']")).click();

        System.out.println(driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_Date1']")).getText());


        //Calendar with an associated button:

        System.out.println("Calendar with an associated button:------------------------------------------------------");

        driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_Image1']")).click();

        for(int i=0;i<=5;i++){

            for(int j = 0;j<=6;j++){

                System.out.print(driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_calendarButtonExtender_day_"+i+"_"+j+"']")).getText()+"-");

            }
            System.out.println();
        }

        Thread.sleep(5000L);
        driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_Image1']")).click();
        driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_calendarButtonExtender_day_3_3']")).click();

        System.out.println(driver.findElement(By.xpath("//*[@id='ctl00_SampleContent_Date5']")).getText());


    }