Shortcut to display the value form.
protected function showValueForm(&$form, &$form_state) {
$this
->valueForm($form, $form_state);
if (empty($this->no_operator)) {
$form['value']['#prefix'] = '<div class="views-group-box views-right-70">' . (isset($form['value']['#prefix']) ? $form['value']['#prefix'] : '');
$form['value']['#suffix'] = (isset($form['value']['#suffix']) ? $form['value']['#suffix'] : '') . '</div>';
}
}