MS chart using polygonannotation and specific series point

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C#

.NET

MSChart

Hi, i'm trying to use PolygonAnnotation to draw a Polygon within a chart where i have four points that i would like to use as vertex.
These Points are putted at runtime in a Bubble Series

System.Windows.Forms.DataVisualization.Charting.Series serieSA = chartCartesian.Series.FindByName("SeriesSafetyArea");
            
            DataPoint dpA = new DataPoint(radarConfigured.SafetyArea.PointA.X,new Double[]{radarConfigured.SafetyArea.PointA.Y, -20});
            DataPoint dpB = new DataPoint(radarConfigured.SafetyArea.PointB.X, new Double[]{radarConfigured.SafetyArea.PointB.Y, -20});
            DataPoint dpC = new DataPoint(radarConfigured.SafetyArea.PointC.X, new Double[] { radarConfigured.SafetyArea.PointC.Y, -20 });
            DataPoint dpD = new DataPoint(radarConfigured.SafetyArea.PointD.X, new Double[] { radarConfigured.SafetyArea.PointD.Y, -20 });
            dpA.Label = "A";
            dpB.Label = "B";
            dpC.Label = "C";
            dpD.Label = "D";
            serieSA.Points.Add(dpA);
            serieSA.Points.Add(dpB);
            serieSA.Points.Add(dpC);
            serieSA.Points.Add(dpD);

I would like to obtain a figure like a rectangle using these points. i've tried usign this code

What I have tried:

safetyAreaAnnotation = new PolygonAnnotation();
            safetyAreaAnnotation.ClipToChartArea = chartCartesian.ChartAreas[0].Name;
            //safetyAreaAnnotation.AnchorX = 10;
            //safetyAreaAnnotation.AnchorY = 20;
            PointF[] points = new PointF[4];
            points[0].X = (float)dpA.XValue;
            points[0].Y = (float)dpA.YValues[0] ;
            points[1].X = (float)dpB.XValue;
            points[1].Y = (float)dpB.YValues[0];
            points[2].X = (float)dpC.XValue;
            points[2].Y = (float)dpC.YValues[0];
            points[3].X = (float)dpD.XValue;
            points[3].Y = (float)dpD.YValues[0];
            byte[] type = new byte[4];
            type[0] = (byte)PathPointType.Start;
            type[1] = (byte)PathPointType.Line;
            type[2] = (byte)PathPointType.Line;
            type[3] = (byte)PathPointType.CloseSubpath;

            safetyAreaAnnotation.GraphicsPath=new System.Drawing.Drawing2D.GraphicsPath(points,type);  
           // //safetyAreaAnnotation.IsSizeAlwaysRelative = false;
           // //safetyAreaAnnotation.BackColor = Color.Red;
           safetyAreaAnnotation.AxisX = chartCartesian.ChartAreas[0].AxisX;
           safetyAreaAnnotation.AxisY = chartCartesian.ChartAreas[0].AxisY;
           safetyAreaAnnotation.AnchorDataPoint = serieSA.Points[0];
           // //safetyAreaAnnotation.AnchorX = 1;
           // //safetyAreaAnnotation.AnchorY = 20;
            chartCartesian.Annotations.Add(safetyAreaAnnotation);

But it doesn't work. Nothing is displayed in my chart. Maybe i should use something different to draw this polygon?