calander control does not work on windows7

i have done a windows application using c#(VS2005) and i used calendar controls and i installed WindowsXP, its working fine,but now i installed Windows7 system the calender functionality doesn't work.No error message.
Controls:
        textBox
        Calander
details:
       i wrote a coding for when i select date from calander the date show on textBox
     but date shouldn't show on textBox.it didn't show any error message.


 
please give me any alternative methods.