public function IsModified()
 {
     if (parent::IsModified()) {
         return true;
     }
     // Plugins
     //
     foreach (MetaModel::EnumPlugins('iApplicationObjectExtension') as $oExtensionInstance) {
         if ($oExtensionInstance->OnIsModified($this)) {
             return true;
         }
     }
     return false;
 }