public IHtmlNode NavigationTag()
{
IHtmlNode tag = new HtmlTag("div")
.AddClass(UIPrimitives.Header);
DateTime? focusedDate = Calendar.DetermineFocusedDate();
tag.Children.Add(NavigationLink(CalendarNavigation.Prev, focusedDate,
CompareDates(focusedDate, Calendar.MinDate, true) <= 0 ? true : false));
tag.Children.Add(NavigationLink(CalendarNavigation.Fast, focusedDate, false));
tag.Children.Add(NavigationLink(CalendarNavigation.Next, focusedDate,
CompareDates(focusedDate, Calendar.MaxDate, false) >= 0 ? true : false));
return tag;
}