@Override
    public void addElement(String anObject) {
        Debugger.debug(() -> {
            System.out.println("my add Element working.");
        });
        if (-1 == super.getIndexOf(anObject)) {
            allElems.add(anObject);
            super.addElement(anObject);
            if (!ComboElemPersistence.addComboData(anObject)) {
                throw new ComboDataNotSyncException("combo data persistence failed");
            }
        }
        super.setSelectedItem(anObject);
    }