The code for the event listener is pretty much what was suggested previously:

private function updateHandler(event:CollectionEvent):void {
         Alert.show(" updated");
        }


BindingUtils.bindProperty(lineSeries, "dataProvider", ser, "pointList");

// assignement to pointList which is the dataprovider
ser.pointList.addEventListener(CollectionEvent.COLLECTION_CHANGE,updateHandler);


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