Classes
 ClassDescription
 BasicDragManager 
 CalendarCursorManager Class responsible for handling mouse cursor over FlexCalendar component
 DayViewBasicDragManager 
 DayViewDragManager Class responsible for moving and resizing item renderers in day view.
 DayViewHeaderDragManager Class responsible for moving item renderers in header of day view.
 MonthViewDragManager Class responsible for moving item renderers in month view.