/**
  * Add $childAction to the TableController, and propagate the table adapter, 
  * if it has not been done yet.
  * 
  * @param \Nethgui\Module\ModuleInterface $childAction 
  */
 public function addChild(\Nethgui\Module\ModuleInterface $childAction)
 {
     if ($childAction instanceof \Nethgui\Controller\Table\AbstractAction) {
         if ($childAction instanceof \Nethgui\Controller\Table\AbstractAction && !$childAction->hasAdapter()) {
             $childAction->setAdapter($this->getAdapter());
         }
     }
     return parent::addChild($childAction);
 }