private void Sort()
{
EventsGrouped.Clear();
var sorted = from e in Events
orderby e.Time descending
group e by e.Year into eGroup
select new Grouping <string, Event>(eGroup.Key, eGroup);
foreach (var sort in sorted)
{
EventsGrouped.Add(sort);
}
}
void SortEvents()
{
EventsGrouped.ReplaceRange(Events.GroupByDate());
}