How to bind dynamically menus and submenus in silverlight 4

Generate Menu and SubMenu dynamically :

//Namespace

using System.Windows.Controls;
using SL4PopupMenu;

MainPage.Xaml

  private void GenerateMenu()
        {
            var data = new ObservableCollection("Item 1,Item 2,Item 3,Item 4,Item 6".Split(','));
            DataGrid dataGrid1 = new DataGrid() { ItemsSource = data,Height=700,Width=200 };
            this.LayoutRoot.Children.Add(dataGrid1);

            // Create the submenu
            PopupMenu spmTimeNow = new PopupMenu();
            spmTimeNow.AddItem("Time Now", null);
            // Create the main menu
            PopupMenu pm1 = new PopupMenu();
            pm1.AddItem("Delete row", delegate { data.RemoveAt(pm1.GetClickedElement().GetIndex()); });
            pm1.AddSeparator();
            pm1.AddSubMenu(spmTimeNow, "Get Time ", "Images/arrow.png", null, null, false, null); // Attach the submenu pmTimeSub
            pm1.AddSeparator();
            //pm1.AddItem("Demo2", delegate { this.Content = new Demo2(); });

            // Set dataGrid1 as the trigger element
            pm1.AddTrigger(TriggerTypes.RightClick, dataGrid1);
         
            // Showing main menu
            pm1.Showing += (sender, e) =>
            {
                pm1.PopupMenuItem(0).Header = "Delete " + dataGrid1.SelectedItem;
                pm1.PopupMenuItem(0).IsVisible =
                pm1.PopupMenuItem(1).IsVisible = pm1.GetClickedElement() != null;
            };
            // Showing submenu
            spmTimeNow.Showing += delegate
            {
                spmTimeNow.PopupMenuItem(0).Header = DateTime.Now.ToLongTimeString();
            };
        }

 public MainPage()
        {
            InitializeComponent();
            GenerateMenu();
       
         
        }