code: @Pure
  	public Object getTopContainer() {
  		if (this.mapContainer == null) {
  			return null;
  		}
  		final C container = this.mapContainer.get();
  		if (container == null) {
  			return null;
  		}
  		if (container instanceof GISContentElement<?>) {
  			return ((GISContentElement<?>) container).getTopContainer();
  		}
  		return container;
  	}
docs: Replies the top-most object which contains this MapElement.
  
  @return the top container or <code>null</code>