多个线形图怎么用datatipfunction呢(解决)

private function dataTipFunc(item:HitData):String {
                var cSI:LineSeriesItem = item.chartItem as LineSeriesItem;
                return "<font size='12'><b>月份</b><br /><b>"+cSI.xFilter+ ":</b>" +cSI.yFilter + "</font>";
            }



<mx:LineChart id="lineChart"
            height="100%"
            width="100%"
            showDataTips="true"
            dataTipFunction="dataTipFunc"
            dataProvider="{dp}"
            creationComplete="init(event);">
           
            <mx:series>
                <mx:LineSeries id="lineSeries"
                    xField="x"
                    yField="y"
                >
                <mx:showDataEffect>
                    <mx:SeriesInterpolate duration="1000" />
                </mx:showDataEffect>
                </mx:LineSeries>
                <mx:LineSeries id="lineSeries2"
                    xField="x"
                    yField="r"
                >
                <mx:showDataEffect>
                    <mx:SeriesInterpolate duration="100" />
                </mx:showDataEffect>
                </mx:LineSeries>
            </mx:series>  
        </mx:LineChart>