private void addValue(AjaxRequestTarget target) {
FieldModel fieldModel = model.getObject().getField();
fieldModel.addValue();
ListView listView = findParent(ListView.class);
target.add(listView.getParent());
}
private void removeValue(AjaxRequestTarget target) {
ValueModel valueModel = model.getObject();
FieldModel fieldModel = valueModel.getField();
fieldModel.removeValue(valueModel);
ListView listView = findParent(ListView.class);
target.add(listView.getParent());
}