滚动不工作与ZedGraph

我在ZedGraph中有一个折线图。每秒钟都有数据从串口传来。图表正在运行。但不滚动(滚动)在X轴上，并被压缩在左上角。我需要图表从右向左滚动，日期和时间出现在X轴

 #region 2 mm zed2mm
            GraphPane myPane02m=zed2mm.GraphPane;
            myPane02m.Fill.Color=System.Drawing.Color.GhostWhite;
            myPane02m.Title.Text="Particle Counter: 2μｍ";
            myPane02m.YAxis.Title.Text="Particles";
            // X AXIS SETTINGS
            myPane02m.XAxis.Title.Text="Date & Time";
            myPane02m.XAxis.Scale.FontSpec.Family="Arial, Narrow";
            myPane02m.XAxis.Scale.FontSpec.Size=14;
            myPane02m.XAxis.Scale.FontSpec.IsBold = false;
            myPane02m.XAxis.MajorGrid.IsVisible = true;
            myPane02m.YAxis.MajorGrid.IsVisible = true;
            myPane02m.XAxis.MajorGrid.DashOff = 15;
            myPane02m.YAxis.MajorGrid.DashOff = 15;
            myPane02m.XAxis.Scale.IsPreventLabelOverlap = false;
            myPane02m.XAxis.Type=AxisType.Date;
            myPane02m.XAxis.Scale.Format = "HH:mm:ss'nyy/MM/dd";
            myPane02m.XAxis.Scale.Min = new XDate(DateTime.Now);       // We want to use time from now
            myPane02m.XAxis.Scale.Max = new XDate(DateTime.Now.AddMinutes(5));        // to 5 min per default
            myPane02m.XAxis.Scale.MinorUnit = DateUnit.Second;         // set the minimum x unit to time/seconds
            myPane02m.XAxis.Scale.MajorUnit = DateUnit.Minute;         // set the maximum x unit to time/minutes
            myPane02m.XAxis.Scale.MinorStep = 1;
            myPane02m.XAxis.Scale.MajorStep = 50;
            myPane02m.XAxis.MinorTic.IsAllTics = true;
            myPane02m.XAxis.MajorTic.IsOpposite = true;
            myPane02m.XAxis.Scale.IsSkipCrossLabel = false;
            //myPane02m.XAxis.Scale.MinGrace = 0;
            //myPane02m.XAxis.Scale.MaxGrace = 0;
            //myPane02m.XAxis.Scale.MinorUnit = DateUnit.Second;
            //myPane02m.XAxis.Scale.MajorUnit = DateUnit.Minute;
            //myPane02m.XAxis.Scale.Min = DateTime.Now.AddSeconds(-60).ToOADate();
            //myPane02m.XAxis.Scale.Max = DateTime.Now.ToOADate();

            // Save 6000 points. At 50 ms sample rate, this is one minute
            // The RollingPointPairList is an efficient storage class that always
            // keeps a rolling set of point data without needing to shift any data values
            RollingPointPairList lista02m_1=new RollingPointPairList(6000);
            RollingPointPairList lista02m_2=new RollingPointPairList(6000);
            RollingPointPairList lista02m_3=new RollingPointPairList(6000);
            RollingPointPairList lista02m_4=new RollingPointPairList(6000);
            RollingPointPairList lista02m_5=new RollingPointPairList(6000);
            RollingPointPairList lista02m_6=new RollingPointPairList(6000);
            // Initially, a curve is added with no data points (list is empty)
            // Color is blue, and there will be no symbols
            LineItem curve02m_1=myPane02m.AddCurve("ID 01",lista02m_1,Color.Red,SymbolType.Circle);
            curve02m_1.Line.IsSmooth=true;
            curve02m_1.Line.SmoothTension=0.3F;
            LineItem curve02m_2=myPane02m.AddCurve("ID_02",lista02m_2,Color.Blue,SymbolType.Diamond);
            curve02m_2.Line.IsSmooth=true;
            curve02m_2.Line.SmoothTension=0.3F;
            LineItem curve02m_3=myPane02m.AddCurve("ID_03",lista02m_3,Color.Black,SymbolType.Plus);
            curve02m_3.Line.IsSmooth=true;
            curve02m_3.Line.SmoothTension=0.3F;
            LineItem curve02m_4=myPane02m.AddCurve("ID_04",lista02m_4,Color.BurlyWood,SymbolType.Star);
            curve02m_4.Line.IsSmooth=true;
            curve02m_4.Line.SmoothTension=0.3F;
            LineItem curve02m_5=myPane02m.AddCurve("ID_05",lista02m_5,Color.Chartreuse,SymbolType.TriangleDown);
            curve02m_5.Line.IsSmooth=true;
            curve02m_5.Line.SmoothTension=0.3F;
            LineItem curve02m_6=myPane02m.AddCurve("ID_06",lista02m_6,Color.Coral,SymbolType.Square);
            curve02m_6.Line.IsSmooth=true;
            curve02m_6.Line.SmoothTension=0.3F;
            // Sample at 50ms intervals
            // Scale the axes
            zed2mm.AxisChange();
            // Redraw the axes
            zed2mm.Invalidate();
            // Save the beginning time for reference
            TickStart=Environment.TickCount;
            #endregion

zed2mm.IsShowHScrollBar = true;
zed2mm.IsAutoScrollRange = true;

double xRange = myPane02m.XAxis.Scale.Max - myPane02m.XAxis.Scale.Min;
myPane02m.XAxis.Scale.Max = new XDate(DateTime.Now);
myPane02m.XAxis.Scale.Min = myPane02m.XAxis.Scale.Max - xRange;