public function getLink( $nid, $tree ){
$id = $nid->nid->value;
$form = [];
$form['view1'] = [
'#type' => 'view',
'#name' => 'view1',
'#display_id' => 'default',
];
$response = new \Drupal\Core\Ajax\AjaxResponse();
$response->addCommand(new \Drupal\Core\Ajax\InsertCommand('#get-children-node-'.$tree, $form));
return $response;
}