gistfile1.txt

 UISelectOne<Object> selectOne = (UISelectOne<Object>) input;
        Converter<Object, String> converter = (Converter<Object, String>) InputComponents.getItemLabelConverter(
            converterFactory, selectOne);
        String value = converter.convert(InputComponents.getValueFor(input));
        final Map<String, Object> items = new HashMap<String, Object>();
        Iterable<Object> valueChoices = selectOne.getValueChoices();
        if (valueChoices != null) {
            for (Object choice : valueChoices) {
                String itemLabel = converter.convert(choice);
                items.put(itemLabel, choice);
                combo.add(itemLabel);
            }
        }