Thanks for the answer, would you have any piece of code to start to work with?

Thanks

DataTable table = Infragistics.UltraChart.Data.DemoTable.AllPositive();
this.ultraChart1.Data.DataSource = table;
this.ultraChart1.Data.DataBind();
this.ultraChart1.ChartType = ChartType.ParetoChart;

for (int current = 0; current < table.Columns.Count; current++)
{
    BoxAnnotation anno = new BoxAnnotation();
    anno.Text = table.Rows[0][current].ToString();
    anno.Location.Type = LocationType.RowColumn;
    anno.Location.Row = 0;
    anno.Location.Column = current;
    anno.PE = new PaintElement(Color.Yellow);
    this.ultraChart1.Annotations.Add(anno);
}

In this case you can try something like: 

protected void Page_Load(object sender, EventArgs e)

    {

        this.UltraChart1.ChartType = ChartType.ParetoChart;

        this.UltraChart1.DataSource = DemoTable.AllPositive();

        this.UltraChart1.DataBind();

        this.UltraChart1.FillSceneGraph += new FillSceneGraphEventHandler(UltraChart1_FillSceneGraph);

    }

    private void UltraChart1_FillSceneGraph(object sender, FillSceneGraphEventArgs e)

    {

        List<Primitive> primitives = new List<Primitive>();

        foreach (Primitive primitive in e.SceneGraph)

        {

            Polyline polyline = primitive as Polyline;

            if (polyline == null)

            {

                continue;

            }

            foreach (DataPoint dataPoint in polyline.points)

            {

                double value = Math.Round((double)dataPoint.Value);

                string strValue = string.Format("{0}%", value);

                Ellipse ellipse = new Ellipse(dataPoint.point, 20);

                ellipse.PE = new PaintElement(Color.Yellow);

                primitives.Add(ellipse);

                Text text = new Text(dataPoint.point, strValue);

                text.labelStyle.HorizontalAlign = StringAlignment.Center;

                text.labelStyle.VerticalAlign = StringAlignment.Center;

                primitives.Add(text);

            }

        }

        foreach (Primitive primitive in primitives)

        {

            e.SceneGraph.Add(primitive);

        }

    }

Hi,

Thanks so much for the code but what is the namespace to use for primitive  ?
using System.???

It's Infragistics.UltraChart.Core.Primitives