import mx.utils.XMLNotifier;

public var updateWatch:XMLNotifier = XMLNotifier.getInstance();

 

......

 

updateWatch.watchXML(Global.usrdb, watch);//<--ошибка

private function watch():void{

                        trace("Изменено!")

                }

    public function watchXML(xml:Object, notifiable:IXMLNotifiable, uid:String = null):void

    {

        if ((xml is XMLList) && xml.length() > 1)

        {

            for each(var item:Object in xml)

            {

                watchXML(item, notifiable, uid);

            }

        }

        else

        {

            // An XMLList object behaves like XML when it contains one

            // XML object.  Casting to an XML object is necessary to

            // access the notification() function.

            var xmlItem:XML = XML(xml);

 

            // First make sure the xml node has a notification function.

            var watcherFunction:Object = xmlItem.notification();

 

            if (!(watcherFunction is Function))

            {

                watcherFunction = initializeXMLForNotification();

                xmlItem.setNotification(watcherFunction as Function);

                if (uid && watcherFunction["uid"] == null)

                    watcherFunction["uid"] = uid;

            }

 

            // Watch lists are maintained on the notification function.

            var xmlWatchers:Dictionary;

            if (watcherFunction["watched"] == undefined)

                watcherFunction["watched"] = xmlWatchers = new Dictionary(true);

            else

                xmlWatchers = watcherFunction["watched"];

 

            xmlWatchers[notifiable] = true;

        }

    }