// @formatter:off
public void addComponentAddedListener (Consumer<? super GUIComponent> listener) {componentAddedListeners .add (listener);}
public void addComponentRemovedListener (Consumer<? super GUIComponent> listener) {componentRemovedListeners.add (listener);}
// @formatter:off
public void addComponentAddedListener (Consumer<? super GUIComponent> listener) {componentAddedListeners .add (listener);}
public void addComponentRemovedListener (Consumer<? super GUIComponent> listener) {componentRemovedListeners.add (listener);}