Well i made a workaround for my problem:protected function
initializeHandler(event:FlexEvent):void{ //at first fill, the
entetiesAC.list will be set to a mx.data.DataList numberRangeProxy.fill(
entetiesAC ); //catch the CollectionEvent before the
ListCollectionView.listChangeHandler gets the event
numberRangesAC.list.addEventListener(CollectionEvent.COLLECTION_CHANGE,
collectionChangeHandler, false, int.MAX_VALUE, true);}protected function
collectionChangeHandler(event: CollectionEvent) : void{ ...