Problem on browser for window phone 7

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C#

Mobile

Silverlight

, +

Excuse me, everyone!
I am confused now.So please forgive me if i would do anything wrong.
Actually, I am doing my project with Google map on Window phone 7.
When i test my project, i have a error.
That's my context menu. It didn't show up in webbrowser for window phone 7.
I really don't know why???
So i don't know how to solve it.
Please someone help me.
my HTML for loading in browser for window phone 7:

http://www.mediafire.com/?gyvahdkk6j6jtoj[^]
and my code :

private void Browser_Loaded(object sender, RoutedEventArgs e)
      {

        // Load HTML document as a string
       Browser.IsScriptEnabled = true;
       Uri uri = new Uri("Context.html", UriKind.Relative);
       Stream stream = Application.GetResourceStream(uri).Stream;
       using (StreamReader reader = new StreamReader(stream))
       {
           // Navigate to HTML document string
           Browser.NavigateToString(reader.ReadToEnd());
       }
      }

Please help me.
Thank alot.