checkBoxList in Wpf

using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Documents;

namespace WpfApplicationCheckBoxList
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window, INotifyPropertyChanged
    {
        #region Instance Variables
        List<checklistitem> checkList;
        #endregion /Instance Variables

        #region INotifyPropertyChanged
        //Add this bit of code to all your code behinds
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, e);
            }
        }
        #endregion /INotifyPropertyChanged

        //Constructor
        public Window1()
        {
            InitializeComponent();
            CheckList = GenerateTestData();
        }

        //Property to bind to
        public List<checklistitem> CheckList
        {
            get { return checkList; }
            set { checkList = value; this.OnPropertyChanged(new PropertyChangedEventArgs("CheckList")); }
        }

        //Test data helper
        List<checklistitem> GenerateTestData()
        {
            List<checklistitem> checkListItems = new List<checklistitem>();
            checkListItems.Add(new CheckListItem { TheText = "My Text Here 1", IsSelected = false });
            checkListItems.Add(new CheckListItem { TheText = "My Text Here 2", IsSelected = true });
            checkListItems.Add(new CheckListItem { TheText = "My Text Here 3", IsSelected = false });
            return checkListItems;
        }
    }
}

<window x:class="WpfApplicationCheckBoxList.Window1" xmlns:x="#unknown">
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" 
    Height="400" 
    Width="600"
    DataContext="{Binding RelativeSource={RelativeSource Self}}">
    <grid>
        <listbox x:name="listExtraSkills" itemssource="{Binding CheckList}" grid.column="1" grid.row="6" height="50">
            <listbox.itemtemplate>
                <datatemplate>
                    <checkbox name="chkitems" content="{Binding TheText}" ischecked="{Binding IsSelected }"></checkbox>
                </datatemplate>
            </listbox.itemtemplate>
        </listbox>
    </grid>
</window>

public class CheckListItem
{
    public string TheText { get; set; }
    public bool IsSelected { get; set; }
}