public function addChild(FlexiObject &$oObject, $sType)
{
if (!isset($this->aChild[$sType])) {
$this->aChild[$sType] = array();
}
$sName = $oObject->getName();
if ($this->existsChild($sName, $sType)) {
throw new Exception("Child already exists: " . $sName);
}
$this->aChild[$sType][$oObject->getName()] =& $oObject;
}
