public function __construct()
 {
     $agendaname = "agenda1";
     $agenda = new AgendaImpl("agenda1");
     $agenda->addItem(new AgendaPictureImpl("A simple item", "IMG_001.jpg"));
     $agenda->addItem(new AgendaMovieImpl("Another item"));
     $this->agendas[$agendaname] = $agenda;
     $agendaname = "agenda3";
     $agenda = new AgendaImpl("agenda3");
     $agenda->addItem(new AgendaPictureImpl("A simple item", "IMG_001.jpg"));
     $agenda->addItem(new AgendaPictureImpl("Something else", "IMG_003.jpg"));
     $agenda->addItem(new AgendaMovieImpl("Another item"));
     $this->agendas[$agendaname] = $agenda;
 }
 public function __construct($title, $imageFilename)
 {
     parent::__construct($title);
     $this->imageFilename = $imageFilename;
 }