/// <summary>
        /// Default constructor.
        /// </summary>
        public SurfaceWindow1()
        {
            InitializeComponent();

            BitmapImage img1_bgr = new BitmapImage();
            string icon1 = "pack://application:,,,/Images/user2.png";
            //scatterView.Items.Add(img1_bgr);

            img1_bgr = new BitmapImage(new Uri("pack://application:,,,/Images/ray.png"));
            users.Add(new User("Sony Xperia Ray", "192.168.1.4", icon1, img1_bgr, android1_tag));

            BitmapImage img2_bgr = new BitmapImage();
            string icon2 = "pack://application:,,,/Images/user1.png";
            img2_bgr = new BitmapImage(new Uri("pack://application:,,,/Images/ideos.png"));
            users.Add(new User("HUAWEI Ideos", "192.168.1.5", icon2, img2_bgr, android2_tag));

            SendImages si = new SendImages();
            si.ip_target = Util.localIPAddress();
            si.method = "SendImages";
            imagesRequest = JsonConvert.SerializeObject(si).ToString();

            Thread t1 = new Thread(() => server());
            t1.Start();
            Thread t2 = new Thread(() => comm_server());
            t2.Start();
            // Add handlers for window availability events
               AddWindowAvailabilityHandlers();
               scatterView.ItemsSource = scatterViewItems;
               //   DataContext = this;
        }
 /// <summary>
 /// check if a command was entered
 /// </summary>
 /// <param name="turnContext">activity received</param>
 /// <param name="user">current user</param>
 private void CheckCommands(ITurnContext turnContext, UserInfo user)
 {
     if (turnContext.Activity.Text.ToLower() == "/test")
     {
         Check.Was_test = true;
         send_image     = new SendImages();
     }
     if (turnContext.Activity.Text.ToLower() == "/answer")
     {
         Check.Was_test          = false;
         SendImages.Was_answer   = true;
         SendImages.Right_answer = true;
         if (user.Current != 0)
         {
             user.Current--;
         }
     }
 }