title: The method or operation is not implemented exception in Script Notify for webview in windows runtime apps c#
body: <p>This below code is working in windows 8, when coming to windows 8.1 universal apps it is showing error method not implemented when assign urls to  wv1.AllowedScriptNotifyUris..</p>
  
  <p>XAML Code:</p>
  
  <pre><code>&lt;WebView Name="wv1" ScriptNotify="wv1_ScriptNotify_1" LoadCompleted="wv1_LoadCompleted_1"/&gt;
  </code></pre>
  
  <p>Cs Code:</p>
  
  <pre><code>private async void BrowserPage_Loaded(object sender, RoutedEventArgs e)
  {
      wv1.Navigate(new Uri("http://www.google.com/search?q=" + "Devi", UriKind.RelativeOrAbsolute));            
  }
  private void wv1_LoadCompleted_1(object sender, NavigationEventArgs e)
  {      
      var absolutepath = e.Uri.Host.ToString() + e.Uri.AbsolutePath.ToString().Substring(0, e.Uri.AbsolutePath.ToString().LastIndexOf('/') + 1);
      allowedUris.Add(new Uri(e.Uri.ToString()));
      wv1.AllowedScriptNotifyUris = allowedUris;//error coming in this line
      string[] args = { "this.newfunc_eventHandler=function(e){e.cancelBubble = true;var  dataValue= document.selection.createRange().htmlText.toString();window.external.notify(dataValue);}" };
      wv1.InvokeScript("eval", args);//error also in this line
      string[] arg = { "document.body.addEventListener('copy',newfunc_eventHandler,true);" };
      wv1.InvokeScript("eval", arg);//error also in this line                                    
  }
  </code></pre>
  
  <p>In windows 8 apps this code is used for enable script when copy button click in webview page. But when coming to windows 8.1 Universal apps while assign url and script it returns method not implemented error.please help to solve this problem...</p>