public CellValueDetails(ICalendarCell calendarCell, string nameOfFile)
{
cell = calendarCell ?? throw new ArgumentNullException(nameof(calendarCell) + " can not be null");
fileName = nameOfFile;
}
protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
{
ICalendarCell cell = item as ICalendarCell;
return(cell != null && cell.State.HasFlag(CalendarCellState.Special) ? SpecialDateTemplate : null);
}