Sample of ListView with GroupDisplayBinding

gistfile1.txt

var lv = new ListView {BindingContext = fooViewModel, IsGroupingEnabled = true, GroupDisplayBinding = new Binding ("Name")};

public class FooViewModel
		{
			List<Group<string>> _things;
			public List<Group<string>> Things {
				get 
				{ 
					return _things ?? (_things = new List<Group<string>> {
						new Group<string>(new []{"A","B","C","D","E","F","G","H","I","J","K"}) {Name = "Letters", Key ="L"},
						new Group<string>(new []{"1","2","3","4","5","6","7","8","9","10"}) {Name = "Numbers", Key ="N"}
					}); 
				}
			}

			bool _canExecute;
			public bool CanExecute {
				get 
				{ 
					return _canExecute;
				}
				set { 
					_canExecute = value;
					RefreshThingsCommand.ChangeCanExecute ();
				}
			}

			Command _refreshThingsCommand;
			public Command RefreshThingsCommand {
				get {return _refreshThingsCommand ?? (_refreshThingsCommand = new Command (BeginRefreshThings, () => _canExecute ));}
			}

			protected void BeginRefreshThings()
			{

			}
		}

		public class Group<T> : ObservableCollection<T>
		{
			public Group (IEnumerable<T> seed) : base(seed){}

			public string Name {
				get;
				set;
			}

			public string Key {
				get;
				set;
			}
		}