[Débutant] ValueConversion n'est pas reconnue.

bonjour
j'utilise Silverlight4 vs2010 j'ai le probleme :
ValueConversion n'est pas reconnue pourtant ya le System.Windows.Data

mon code :
Code:
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namespace test_passage_paramaitre
{
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Navigation;
    using test_passage_paramaitre.LoginUI;
    using System.Windows.Data;
    using System.Globalization;
    using System;
 
 
    /// <summary>
    /// <see cref="UserControl"/> class providing the main UI for the application.
    /// </summary>
    public partial class MainPage : UserControl
    {
        /// <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);
        }
 
 
 
 
 
    }
 
 
 
    [ValueConversion(typeof(string), typeof(Visibility))]
    public class NameToVisibilityConverter : IValueConverter
    {
        public string Name { get; set; }
 
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string s = (string)value;
            if (Name == value)
                return Visibility.Visible;
            return Visibility.Collapsed;
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }
 
 
}