private void ModelShipChangedEventHandler(object sender, ShipChangedEventArgs e)
 {
     if (!e.Killed)
     {
         if (e.ShipUpdated is Invader)
         {
             Invader invader = e.ShipUpdated as Invader;
             if (!_invaders.ContainsKey(invader))
             {
                 FrameworkElement invaderControl = InvadersHelper.InvaderControlFactory(invader, Scale);
                 _invaders[invader] = invaderControl;
                 _sprites.Add(invaderControl);
             }
             else
             {
                 FrameworkElement invaderControl = _invaders[invader];
                 InvadersHelper.MoveElement(invaderControl, invader.Location.X, Scale, invader.Location.Y * Scale);
                 InvadersHelper.ResizeElement(invaderControl, invader.Size.Width * Scale, invader.Size.Height * Scale);
             }
         }
         else if (e.ShipUpdated is Player)
         {
             if (_playerFlashing)
             {
                 AnimatedImage playerImage = _playControl as AnimatedImage;
                 _playerFlashing = false;
             }
             if (_playControl == null)
             {
                 FrameworkElement playerControl = InvadersHelper.PlayerControlFactory(player, Scale);
                 _sprites.Add(playerControl);
             }
         }
     }
 }