You can show and hide the calendar control with its ".Visible" property. If you use pure postback, you could create a linkbutton (or any command control) as the "pick date" button. The click handler for this control would set the calendar Visible to true. Then when you choose a date, you can hide the calendar.
Take a look at the MSDN docs for this controls members:
http://msdn.microsoft.com/library/en...mberstopic.asp
When you set the selected date for the control, you usually also need to set the "VisibleDate" property otherwise the calendar may not show the SelectedDate (unless it's close enough to the current date which is the calendar default view).
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Peter