def update_event_types(self):
        """Update event types in event type box."""
        self.idx_evt_type.clear()
        self.idx_evt_type.setSelectionMode(QAbstractItemView.ExtendedSelection)
        event_types = sorted(self.parent.notes.annot.event_types,
                             key=str.lower)

        for ty in event_types:
            item = QListWidgetItem(ty)
            self.idx_evt_type.addItem(item)
Update event types in event type box.