private void App_TypingHandler(object sender, App.TypingArgs e)
 {
     if (DisplayedMember != null)
     {
         if (e.UserId == DisplayedMember.Raw.User.Id)
         {
             DisplayedMember.IsTyping = e.Typing && e.ChnId == App.CurrentChannelId;
             if (DisplayedMember.IsTyping)
             {
                 ShowTyping.Begin();
             }
             else
             {
                 HideTyping.Begin();
             }
         }
     }
     else
     {
         App.TypingHandler -= App_TypingHandler;
     }
 }
 /// <summary>
 /// Handle typing event
 /// </summary>
 private async void App_TypingHandler(object sender, App.TypingArgs e)
 {
     // Run on UI thread
     await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                               UpdateTyping);
 }