Same result ..

            private function listDirectories(event:ResultEvent):void {
                var dirs:Array = event.result as Array;

                // if the _directories array is null this is our root
request
                if(_directories == null) {
                    _directories = dirs;
                }else {
                    hold.children = dirs;
                }
                //trace( ObjectUtil.toString(_directories) );
                (tree.dataProvider as ArrayCollection).dispatchEvent(new
CollectionEvent(CollectionEvent.COLLECTION_CHANGE));
            }

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