title: how to disable contextmenu of devexpress themedwindow in wpf c#
body: <p>I’m trying to disable popped contextmenu of ThemedWindow of devexpress when I click titlebar using mouserightbutton.</p>
  <p>I used below code and it works in 'Window', but 'ThemedWindow' isn't working:</p>
  <pre><code>public MainWindow()
  {
      InitializeComponent();
      Loaded += MainWindow_Loaded;
  }
  
  private void MainWindow_Loaded(object sender, RoutedEventArgs e)
  {
      IntPtr windowHandle = new WindowInteropHelper(this).Handle;
      HwndSource hwndSource = HwndSource.FromHwnd(windowHandle);
      hwndSource.AddHook(new HwndSourceHook(WndProc));
  }
  
  private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
  {
      if (msg == 0xa4)
      {
          handled = true;
      }
      return IntPtr.Zero;
  }
  </code></pre>
  <p>If I want to do same thing in ThemedWindow, what should I do?</p>