Which calendar event to consider when user selects same date

[yakuza]

Am using link button to toggle the calendar.Ive used \[code\]calendar.selection_changed\[/code\] eventto grab the date and i hide the calendar control.But if the user trys to select the same date again what event should i consider to grab the date and change the visibility of calendar.ThanksPS: If i use \[code\]enable view state\[/code\] property it works for same date but toggle stops working.