static function displayTabContentForItem(CommonGLPI $item, $tabnum = 1, $withtemplate = 0)
 {
     switch ($tabnum) {
         case 0:
             $item->showForm(1);
             break;
         case 1:
             PluginGeninventorynumberConfigField::showForConfig($item->getID());
             break;
     }
     return TRUE;
 }