The ShowCalendarHeader property determines whether or not the calendar header is shown at
the top of the WallCalendar component. The calendar header contains the the buttons to
increase and decrease the date and year, the month combo box and year spin edit, along with the day
of the week column headers.
Setting the ShowCalendarHeader property to false allows you to create a custom navigation
scheme, using the CalendarMonth and CalendarYear properties to manipulate the calendar.
