How to modify or disable context menu in the title bar?

I need to disable context menu in the title bar in the WPF window which uses WindowChrome:

<Window x:Class="WpfApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        ContextMenu="{x:Null}">
    <WindowChrome.WindowChrome>
        <WindowChrome CaptionHeight="35"
                      CornerRadius="0"
                      ResizeBorderThickness="5"
                      UseAeroCaptionButtons="False" />
    </WindowChrome.WindowChrome>
</Window>

ContextMenu="{x:Null}" doesn't work. The following instructions don't work too: http://codereply.com/answer/7etz8e/remove-title-bars-context-menu-completely-wpf-window.html The context menu in the title bar appears always with no change. Somebody has an idea?

---

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Loaded += OnLoaded;
    }

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        IntPtr windowhandle = new WindowInteropHelper(this).Handle;
        HwndSource hwndSource = HwndSource.FromHwnd(windowhandle);
        hwndSource.AddHook(new HwndSourceHook(WndProc));
    }

    private const uint WM_SYSTEMMENU = 0xa4;
    private const uint WP_SYSTEMMENU = 0x02;

    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        if ((msg == WM_SYSTEMMENU) && (wParam.ToInt32() == WP_SYSTEMMENU))
        {
            handled = true;
        }

        return IntPtr.Zero;
    }
}

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