this.add(back, Vector.ZERO);
this.list.put(FORTH_POS, forth);
this.invertList.put(forth, FORTH_POS);
this.add(forth, Vector.ZERO);
back.addInformable(this);
forth.addInformable(this);
}
public void addButton(InterfaceButton object) {
this.list.put(this.next, object);
this.invertList.put(object, this.next);