Change the Main window implementation Code to User control

HI ,

Im Using the following code which is working well,my question is how to use it with User control

 public partial class MainWindow : Window
    {
        public ObservableCollection<User> _UsersList = new ObservableCollection<User>();
        private readonly Dictionary<string, string> _mapping = new Dictionary<string, string>();
        private const string DRAG_SOURCE = "DragSource";

        public MainWindow()
        {

            InitializeComponent();
            _UsersList.Add(new User { Name = "Jhon" });
            _UsersList.Add(new User { Name = "Mike" });
            _UsersList.Add(new User { Name = "Alex" });
            _UsersList.Add(new User { Name = "Darl" });

            CollectionViewSource source = this.Resources["source"] as CollectionViewSource;
            source.Source = _UsersList;
            ListBox.SelectionChanged += listbox_SelectionChanged;

            DataObject.AddCopyingHandler(text1, DragCopy);
            DataObject.AddCopyingHandler(text2, DragCopy);
        }

        public ObservableCollection<User> UserList
        {
            get { return _UsersList; }
        }


        private void listbox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (e.AddedItems.Count == 1)
            {
                if (ListBox.SelectedItems.Count > 0)
                {
                    var mySelectedItem = ListBox.SelectedItem as User;
                    if (mySelectedItem != null)
                    {
                        DragDrop.DoDragDrop(ListBox, mySelectedItem,
                        DragDropEffects.Copy | DragDropEffects.Move);

                    }
                }
            }
        }

        private void DropText_PreviewDragEnter(object sender, DragEventArgs e)
        {
            e.Effects = DragDropEffects.None;
        }

        private void DropText_PreviewDrop(object sender, DragEventArgs e)
        {
            var textbox = (TextBox)sender;

            if (!(textbox.Text.Length > 0))
            {

                DataObject data = e.Data as DataObject;
                User user = data.GetData(typeof(User)) as User;
                textbox.Tag = user;

                var name = user.Name;
                textbox.Text += name;
                textbox.Focus();
                textbox.CaretIndex = textbox.Text.Length;
                e.Handled = true;
                var remove = _UsersList.Remove((User)ListBox.SelectedItem);

                if (!_mapping.ContainsKey(textbox.Name))
                    _mapping.Add(textbox.Name, name);
            }

            e.Handled = true;
        }

        private void DropText_PreviewDragOver(object sender, DragEventArgs e)
        {
            e.Handled = true;
        }

        private void ListBox_Drop(object sender, DragEventArgs e)
        {
            DataObject data = e.Data as DataObject;
            if (data != null)
            {
                User user = data.GetData(typeof(User)) as User;
                if (user != null && !_UsersList.Contains(user))
                    _UsersList.Add(user);
            }


            TextBox txtBox = e.Data.GetData(DRAG_SOURCE) as TextBox;
            if (txtBox != null)
            {
                if (_mapping.ContainsKey(txtBox.Name))
                    _mapping.Remove(txtBox.Name);
                txtBox.Dispatcher.BeginInvoke((Action)(() => { txtBox.Text = string.Empty; }), System.Windows.Threading.DispatcherPriority.Normal);
            }
            e.Handled = true; 
       }

        private void DragCopy(object sender, DataObjectCopyingEventArgs e)
        {
            if (e.IsDragDrop)
            {
                e.CancelCommand();
                TextBox txtBox = sender as TextBox;
                if (txtBox != null && txtBox.Tag != null)
                {
                    DataObject dataObject = new DataObject(txtBox.Tag);
                    dataObject.SetData(DRAG_SOURCE, txtBox);
                    DragDrop.DoDragDrop(sender as DependencyObject, dataObject, DragDropEffects.Move | DragDropEffects.Copy);
                }
                e.Handled = true;
            }
        }

        private void DropText_TextChanged(object sender, TextChangedEventArgs e)
        {
            TextBox txtBox = sender as TextBox;
            if (txtBox.Text == string.Empty)
            {
                User user = txtBox.Tag as User;

                if(user != null && !_UsersList.Contains(user))
                    _UsersList.Add(user);

                if (_mapping.ContainsKey(txtBox.Name))
                    _mapping.Remove(txtBox.Name);
            }
        }
    }

XAML

<ListBox x:Name="ListBox" HorizontalAlignment="Left" Height="115"
                  VerticalAlignment="Top" Width="150" ItemsSource="{Binding Source={StaticResource source}}" 
                 DisplayMemberPath="Name"
                 AllowDrop="True" Drop="ListBox_Drop" />

<Window.Resources><CollectionViewSource x:Key="source"></CollectionViewSource></Window.Resources>

<TextBox x:Name="text1"  
                  AcceptsReturn="True"
                  AllowDrop="True" 
                  PreviewDragEnter="DropText_PreviewDragEnter"
                  PreviewDrop="DropText_PreviewDrop"
                  PreviewDragOver="DropText_PreviewDragOver"
                  TextChanged="DropText_TextChanged"
                  Grid.Column="1"
                  HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" 
                  VerticalAlignment="Top" Width="120"/><TextBox x:Name="text2"  
                  AcceptsReturn="True"
                  AllowDrop="True" 
                  PreviewDragEnter="DropText_PreviewDragEnter"
                  PreviewDrop="DropText_PreviewDrop"
                  PreviewDragOver="DropText_PreviewDragOver"
                  TextChanged="DropText_TextChanged"
                  Grid.Column="1"
                  HorizontalAlignment="Left" Height="23" TextWrapping="Wrap"
                  VerticalAlignment="Top" Width="120"/>