I have 2 questions.
1.
I made Drill-down-chart.

that chart rises 2 tooltips.

maybe, One is  the default tooltip(Yvalue-label).
Another tooltip is graph.

I want to only graph tooltip.
What must I do?

2.
and SomeTime,I Clicked the value and then are moved to a different graph.
but Tooltip of the previous graph does not disapear.
I use WCF.(maybe, some delay)
I want to remove tooltip.
What must I do?

                RadChart1.DefaultView.ChartArea.ChartItemClick -= this.RadChart1ChartItemDayClicked;
                RadChart1.DefaultView.ChartArea.ChartItemClick -= this.RadChart1ChartItemMonthClicked;
                RadChart1.DefaultView.ChartArea.ChartItemClick -= this.RadChart1ChartItemYearClicked;
                ////////////////
                RadChart1.SeriesMappings.Clear();
                SeriesMapping sm1 = new SeriesMapping();
                BarSeriesDefinition d1 = new BarSeriesDefinition();
                d1.ShowItemToolTips = false;
                d1.ShowItemLabels = false;
                //barSeries.Definition.ShowItemToolTips = true;
               
                sm1.SeriesDefinition = d1;
                sm1.LegendLabel = "Bar Series";
                sm1.CollectionIndex = 0;
               
                RadChart1.DefaultView.ChartTitle.Content = string.Format("Year(TAGID: {0})", tagID);
                ItemMapping im1 = new ItemMapping();
                im1.DataPointMember = DataPointMember.YValue;
                sm1.ItemMappings.Add(im1);

                RadChart1.SeriesMappings.Add(sm1);

                DoseRate.GetServiceDB.ps_Tag결과 a = item.Item as DoseRate.GetServiceDB.ps_Tag결과;
                DoseRate.GetServiceDB.DoseRateDBServiceClient dbClient = new DoseRate.GetServiceDB.DoseRateDBServiceClient();
                dbClient.ps_tagDoseRateYearCompleted += new EventHandler<DoseRate.GetServiceDB.ps_tagDoseRateYearCompletedEventArgs>(dbClient_ps_tagDoseRateYearCompleted);
                dbClient.ps_tagDoseRateYearAsync(a.tagid);
               
                tagID = a.tagid;
              
               
                RadChart1.DefaultView.ChartTitle.Content = string.Format("Year(TAGID: {0})", tagID);
                RadChart1.DefaultView.ChartArea.ItemToolTipOpening -= new ItemToolTipEventHandler(ChartItemToolTipOpeningMonth);
                RadChart1.DefaultView.ChartArea.ItemToolTipOpening -= new ItemToolTipEventHandler(ChartItemToolTipOpeningDay);
                RadChart1.DefaultView.ChartArea.ItemToolTipOpening -= new ItemToolTipEventHandler(ChartItemToolTipOpeningHour);
                RadChart1.DefaultView.ChartArea.ItemToolTipOpening += new ItemToolTipEventHandler(ChartItemToolTipOpeningMonth);

                ////////////////
                RadChart1.DefaultView.ChartArea.ChartItemClick += this.RadChart1ChartItemYearClicked;
                ////////////////
                d1.ShowItemToolTips = true;

///////////////////////////////////////////WCF to List
    ChartValueMonth = new double[e.Result.Count];
            ChartValueMonthVlue = new double[e.Result.Count];

            int count = 0;
            foreach (DoseRate.GetServiceDB.ps_tagDoseRateMonth결과 item in e.Result)
            {
                ChartValueMonth[count] = (double)item.month;
                ChartValueMonthVlue[count] = Math.Round((double)item.doserate, 2);
                count++;
            }

            List<double[]> itemsSource = new List<double[]>
                {
                    ChartValueMonthVlue
                };
            int startYear = 0;
            chart.ItemsSource = itemsSource;
            foreach (TickPoint tickPoint in chart.DefaultView.ChartArea.AxisX.TickPoints)
            {
                tickPoint.Label = ChartValueMonth[startYear].ToString();
                startYear++;
            }