textsToRemove = Collections.synchronizedList(new LinkedList<RemovableSprite>());
staticSprites = Collections.synchronizedList(new LinkedList<RemovableSprite>());
entities = new HashMap<IEntity, EntityView>();
// create ground
ground = new GroundContainer(client, this, this);
// register native event handler
addMouseListener(ground);
addMouseWheelListener(ground);
addMouseMotionListener(ground);