gistfile1.txt

using System;
using System.Collections.ObjectModel;
using Xamarin.Forms;
using Xamarin.Forms.PlatformConfiguration;
using Xamarin.Forms.PlatformConfiguration.AndroidSpecific;

namespace GroupingSampleListView
{
	public class GroupedListCode : ContentPage
	{
		private ObservableCollection<GroupedVeggieModel> grouped { get; set; }

		public GroupedListCode ()
		{
			var lstView = new Xamarin.Forms.ListView();
			grouped = new ObservableCollection<GroupedVeggieModel>();

			var letters = "mtwtfss";
			//letters += "mtwtfss"; letters += "mtwtfss"; letters += "mtwtfss";
			for (int i = 0; i < letters.Length; i++) {
				string letter = letters[i].ToString();
				var group = new GroupedVeggieModel { LongName = letter.ToUpper() + " Section", ShortName = letter + letter };
				for (int j = 0; j < 20; j++) {
					group.Add(new VeggieModel { Name = letter + " item " + j.ToString(), IsReallyAVeggie = true, Comment = "Comment" });
				}
				grouped.Add(group);
			}

			lstView.ItemsSource = grouped;
			lstView.IsGroupingEnabled = true;
			lstView.GroupDisplayBinding = new Binding ("LongName");
			lstView.GroupShortNameBinding = new Binding ("ShortName");

			lstView.On<Android>().SetIsFastScrollEnabled(true);

			lstView.ItemTemplate = new DataTemplate (typeof(TextCell));
			lstView.ItemTemplate.SetBinding (TextCell.TextProperty, "Name");
//			lstView.ItemTemplate.SetBinding (TextCell.DetailProperty, "Comment");
			Content = lstView;
		}
	}
}