code: public static void removeEveryMenu (Stage stage) {
  		for (Actor actor : stage.getActors()) {
  			if (actor instanceof PopupMenu) {
  				PopupMenu menu = (PopupMenu) actor;
  				menu.removeHierarchy();
  			}
  		}
  	}
docs: Removes every instance of {@link PopupMenu} form {@link Stage} actors.
  <p>
  Generally called from {@link ApplicationListener#resize(int, int)} to remove menus on resize event.