controler un bouton d'une page apartir d'une autre page silverlight

voila mon pb c que j'au 2 pages : MainPages.cs et Home.cs
dans home page ya un bouton pour controler un bouton sur MaiPage
mon code :

le message s'affiche mais pour le bouton link2 ne change pas :calim2: ?????

Home.cs

Code:

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public partial class Home : Page
    {
        /// <summary>
        /// Creates a new <see cref="Home"/> instance.
        /// </summary>
        public Home()
        {
            InitializeComponent();
 
            this.Title = ApplicationStrings.HomePageTitle;
        }
 
        /// <summary>
        /// Executes when the user navigates to this page.
        /// </summary>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }
 
        private void button1_Click(object sender, System.Windows.RoutedEventArgs e)
        {
 
            MainPage.Instance.test();
 
 
 
        }
    }

ma page MainPage

Code:

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 public partial class MainPage : UserControl
    {
 
 
        private static MainPage _Instance;
 
        public static MainPage Instance
        {
            get
            {
                if (_Instance == null) _Instance = new MainPage();
                return _Instance;
            }
        }
 
 
        /// <summary>
        /// Creates a new <see cref="MainPage"/> instance.
        /// </summary>
        public MainPage()
        {
            InitializeComponent();
            this.loginContainer.Child = new LoginStatus();
        }
 
        /// <summary>
        /// After the Frame navigates, ensure the <see cref="HyperlinkButton"/> representing the current page is selected
        /// </summary>
        private void ContentFrame_Navigated(object sender, NavigationEventArgs e)
        {
            foreach (UIElement child in LinksStackPanel.Children)
            {
                HyperlinkButton hb = child as HyperlinkButton;
                if (hb != null && hb.NavigateUri != null)
                {
                    if (hb.NavigateUri.ToString().Equals(e.Uri.ToString()))
                    {
                        VisualStateManager.GoToState(hb, "ActiveLink", true);
                    }
                    else
                    {
                        VisualStateManager.GoToState(hb, "InactiveLink", true);
                    }
                }
            }
        }
 
        /// <summary>
        /// If an error occurs during navigation, show an error window
        /// </summary>
        private void ContentFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            e.Handled = true;
            ErrorWindow.CreateNew(e.Exception);
        }
 
 
        public void test()
        {
 
            System.Windows.MessageBox.Show("gggggghhhhhxxxxxxxxhbbbbbbxxxxxxxx");
            //link2.Visibility = System.Windows.Visibility.Collapsed; 
 
            MainPage.Instance.Link2.Visibility = System.Windows.Visibility.Visible;
        }
 
 
 
 
 
 
    }