Hello,

In order to draw an element onto the chart you should handle OnFillSceneGraph event. Then you should to create an instance of primitive that you want to draw, set point (location of this element). It will be good if you associate this primitive with data point of the chart, and then to add this primitive to SceneGraph of the argument. You should use code like this:

ChartLayer layer = e.ChartCore.GetChartLayer();

            //this primitive represent histogram line

            IEnumerable<Polyline> pl = layer.ChartCore.SceneGraph.OfType<Polyline>();

            if (pl.Count<Polyline>() > 0)

            {

                Polyline pol = pl.First<Polyline>();

                //iterate trough all data point of the histogram to find these point

                //which matches to some condition

                foreach (DataPoint dp in pol.points)

                {

                    if (dp.Value != null && ((double)dp.Value) > 0.08d)

                    {

                        //create a primitive (in this case this is a symbol)

                        Infragistics.UltraChart.Core.Primitives.Symbol symbol = new Symbol(Infragistics.UltraChart.Shared.Styles.SymbolIcon.Plus, Infragistics.UltraChart.Shared.Styles.SymbolIconSize.Medium);

                        symbol.DataPoint = dp.DataPoint;

                        symbol.fillColor = Color.Violet;

                        symbol.PE.Fill = Color.Violet;

                        symbol.Layer = dp.Layer;

                        symbol.point = dp.point;

                        //add primitive to the ScreneGraph

                        e.SceneGraph.Add(symbol);

                    }

                }

            }

Let me know if you have any further questions.

That worked...thanks!

BTW: Are there any samples that show how to draw extra lines onto column graphs or histograms? I need to draw some marker lines to represent AUR and other values.

thanks

-Ken