protected function addFieldValue()
    {
        $this->controlAccess('field_value_add');

        if ($this->field_value->add($this->getSubmitted())) {
            $url = "admin/content/field/value/{$this->data_field['field_id']}";
            $this->redirect($url, $this->text('Field value has been added'), 'success');
        }

        $this->redirect('', $this->text('Field value has not been added'), 'warning');
    }