// http://stackoverflow.com/q/25251213/1174169

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

​

namespace WpfApplication1

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent ();

        }

    }

​

    public class BaseVM : INotifyPropertyChanged

    {

​

        public event PropertyChangedEventHandler PropertyChanged;

​

        protected void Notify(string name)

        {

            var h = PropertyChanged;

            if (h != null)

                h(this, new PropertyChangedEventArgs(name));

        }

    }

​

    public class ViewModel : BaseVM

    {

        ObservableCollection<Row> _rows = new ObservableCollection<Row> ();

        public ObservableCollection<Row> Rows { get { return _rows; } }

​

        public ViewModel()

        {

            _rows.Add (new DividerRow () { Title = "Fruit" });

            _rows.Add (new KeyValueRow () { Key = "Apple", Value = "$1.01" });

            _rows.Add (new KeyValueRow () { Key = "Apricot", Value = "$2.01" });

            _rows.Add (new KeyValueRow () { Key = "Pineapple", Value = "$3.01" });

​

            _rows.Add (new DividerRow () { Title = "Meat" });

            _rows.Add (new KeyValueRow () { Key = "Bacon", Value = "$4.01" });

            _rows.Add (new KeyValueRow () { Key = "Ground-Turkey", Value = "$5.01" });

            _rows.Add (new KeyValueRow () { Key = "Sausage", Value = "$6.01" });

            _rows.Add (new KeyValueRow () { Key = "Andmorereallytastystuff", Value = "$7.01" });

        }

    }

​

    public class Row : BaseVM { }

​

    public class DividerRow : Row 

    {

​

        string _title;

        public string Title

        {

            get { return _title; }

            set

            {

                if (_title == value) return;

                _title = value;

                Notify( "Title" );

            }

        }

    }

​

    public class KeyValueRow : Row

    {

​

        string _key;

        public string Key

        {

            get { return _key; }

            set

            {

                if (_key == value) return;

                _key = value;

                Notify( "Key" );

            }

        }

​

​

​

        string _value;

        public string Value

        {

            get { return _value; }

            set

            {

                if (_value == value) return;

                _value = value;

                Notify( "Value" );

            }

        }

    }

​

}

​