DataGrid groupping snippet

What we should get:

XAML:

<Window x:Class="WpfDataGrid1.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Height="350" Width="525">

    <Grid>

        <DataGrid AutoGenerateColumns="False" Margin="15,40,14,12" Name="dataGrid1">

            <DataGrid.GroupStyle>

                <GroupStyle>

                    <GroupStyle.ContainerStyle>

                        <Style  TargetType="{x:Type GroupItem}">

                        <Setter Property="Template">

                            <Setter.Value>

                                <ControlTemplate>

                                    <Expander x:Name="exp" IsExpanded="True"

                                            Background="White"

                                            Foreground="Black">

                                        <Expander.Header>

                                            <TextBlock Text="{Binding Name}"/>

                                        Expander.Header>

                                        <ItemsPresenter />

                                    Expander>

                                ControlTemplate>

                            Setter.Value>

                        Setter>

                        Style>

                    GroupStyle.ContainerStyle>

                    <GroupStyle.Panel>

                        <ItemsPanelTemplate>

                            <DataGridRowsPresenter/>

                        ItemsPanelTemplate>

                    GroupStyle.Panel>

                GroupStyle>

            DataGrid.GroupStyle>

            <DataGrid.Columns>

                <DataGridTextColumn Header="Data2" Binding="{Binding Path=MyItemValue}" Width="*">DataGridTextColumn>

            DataGrid.Columns>

        DataGrid>

    Grid>

Window>

Code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

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 WpfDataGrid1

{

    ///

    /// Interaction logic for MainWindow.xaml

    ///

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            List<MyItem> MyItems = new List<MyItem>

                {

                    new MyItem{ MyItemName= "US", MyItemValue=77 },

                    new MyItem{ MyItemName= "US", MyItemValue=778 },

                    new MyItem{ MyItemName= "US", MyItemValue=78 },

                    new MyItem{ MyItemName= "UK", MyItemValue=7 },

                    new MyItem{ MyItemName= "Israel", MyItemValue=9 },

                    new MyItem{ MyItemName= "Turkey", MyItemValue=98 },

                    new MyItem{ MyItemName= "Turkey", MyItemValue=4 }

                };

            CollectionViewSource collection = new CollectionViewSource();

            collection.Source = MyItems;

            PropertyGroupDescription propertyGroupDescription = new PropertyGroupDescription("MyItemName");

            collection.GroupDescriptions.Add(propertyGroupDescription);

            dataGrid1.ItemsSource = collection.View;

        }

    }

}