/**
* Adds an item as a child of another item.
* Overloads the parent method to make sure that
* we do not add already existing children.
* @param string $itemName the item name.
* @param string $childName the child item name.
* @throws CException if either parent or child doesn't exist or if a loop has been detected.
*/
public function addItemChild($itemName, $childName)
{
// Make sure that the item doesn't already have this child.
if ($this->hasItemChild($itemName, $childName) === false) {
return parent::addItemChild($itemName, $childName);
}
}
