EDIT

        // TODO this.fieldTyp = LazyComboBox.class does not work

        LazyComboBox<V> field = new LazyComboBox<V>(itemType);

        this.fieldType = (Class<LazyComboBox<V>>) field.getClass();

    }

    /**

            field.setCaptionGenerator(captionGenerator);

        }

        field.setValue(val);

        return field;

    }