How to expand GLPI entity tree sons by default

vi ajax/entitytreesons.php

...

 83                   $path['state'] = 'open';
...

119                   $path['state'] = 'open';

...

glpi entities expanded by default

ajax/entitytreesons.php

//   $path['expanded'] = isset($ancestors[$ID]);
     $path['expanded'] = true;
//   $path['expanded'] = isset($ancestors[$row['id']]);
     $path['expanded'] = true;