title: Calendar in gridview edit mode
body: <p>I have a gridview connected to database using sqldatasource. There is a datetime field in the gridview. When I edit the column, I don't want let the user to type manually the date instead 
  First, I want a calender popup or a button to select date from calendar.
  Second, for the time field, is there any template or gui that we can choose time as we select date from calendar??</p>