internal void UpdateDecadeMode()
{
DateTime selectedYear;
if (Owner != null)
{
selectedYear = Owner.DisplayYear;
}
else
{
selectedYear = DateTime.Today;
}
DateTime decade = GetDecadeForDecadeMode(selectedYear);
DateTime decadeEnd = _calendar.AddYears(decade, 9);
SetDecadeModeHeaderButton(decade);
SetDecadeModePreviousButton(decade);
SetDecadeModeNextButton(decadeEnd);
if (_yearView != null)
{
SetYearButtons(decade, decadeEnd);
}
}