Hello Milko, 

I tried to add a legend to my UltraDataChart with dynamic count of LineSeries. I tried to use a UltraLegend and the UltraItemLegend. 

The grid has the property to select the added legend. Unfortunately the legend is empty while adding new Series. The BubbleSeries has a property "LabelMemberPath", which I didn't found while I use LineSeries.

Init DataChart:

 private void InitDataChart()
        {
            yAxis = new NumericYAxis();
            xAxis = new CategoryDateTimeXAxis();

            xAxis.Label = "Termin";
            xAxis.LabelLocation = AxisLabelsLocation.OutsideBottom;

            xAxis.DisplayType = TimeAxisDisplayType.Continuous;
            xAxis.MinimumValue = DateTime.Now - TimeSpan.FromHours(96);
            xAxis.MaximumValue = DateTime.Now;
            xAxis.FormatLabel += XAxis_FormatLabel1;

            yAxis.Label = "Menge";
            yAxis.FormatLabel += YAxis_FormatLabel;
            //ui_DataChart.IsHorizontalZoomEnabled = true;
            //ui_DataChart.IsVerticalZoomEnabled = true;
            
            ui_DataChart.Axes.Add(xAxis);
            ui_DataChart.Axes.Add(yAxis);

           
        }

Handler to Add new Series:

 public void NeueWerte(Bestandsverlauf neueWerte)
        {

            Grid.ApplyDatasource(neueWerte.BestandsListe);
            Grid.Grid.DisplayLayout.Bands[0].Columns["VVIS"].CellClickAction = CellClickAction.EditAndSelectText;
            Grid.Grid.DisplayLayout.Override.AllowUpdate = Infragistics.Win.DefaultableBoolean.True;


            if (neueWerte.SiloBestandsVerlauf != null) 
                {
                    if (neueWerte.SiloBestandsVerlauf != null)
                    {

                       
                        xAxis.DataSource = neueWerte.SiloBestandsVerlauf.Historie;
                        xAxis.DateTimeMemberPath = "Termin";

                        var lineSeries = new LineSeries();
                        lineSeries.ValueMemberPath = _valueMemberPath_;

                        lineSeries.Name = neueWerte.SiloBestandsVerlauf.vPE;

                        lineSeries.XAxis = xAxis;
                        lineSeries.YAxis = yAxis;
                        lineSeries.DataSource = neueWerte.SiloBestandsVerlauf.Historie;
                        lineSeries.Title = neueWerte.SiloBestandsVerlauf.vPE;
                        lineSeries.ShowDefaultTooltip = true;

                        lineSeries.Legend = ultraItemLegend1;
                    ultraItemLegend1.ControlAdded += UltraItemLegend1_ControlAdded;  //Didn't fired
                    ui_DataChart.Series.Add(lineSeries);
                   
                }
                }
            
            Initialized?.Invoke(this, null);
        }

Presented Class 

SiloMengeHist is my DataPointClass. X-Axis = Termin

Y-Axis = Menge

    public class SiloHist: Silo
    {
        [DataMember]
        public List<SiloMengeHist> Historie { get; set; }



        public SiloHist(Silo silo)
        {
            Anlage = silo.Anlage;
            Werk = silo.Werk;
            Buchungskreis = silo.Buchungskreis;
            vPE = silo.vPE;
            Bezeichnung = silo.Bezeichnung;
            Historie = new List<SiloMengeHist>();
        }
        
    }
    [DataContract(Namespace = "PMS.StorageMgmt.Model")]
    public class Silo {

    //Anlage
    [DataMember]
    public string Buchungskreis { get; set; }
    [DataMember]
    public string Werk { get; set; }
    [DataMember]
    public string Anlage { get; set; }
    [DataMember]
    public string vPE { get; set; }
    [DataMember]
    public string Bezeichnung { get; set; }

    }

    [DataContract(Namespace = "PMS.StorageMgmt.Model")]
    public class SiloMengeHist
    {
        [DataMember]
        public string Label { get; set; }
        [DataMember]
        public DateTime Termin { get; set; }
        [DataMember]
        public Double Menge { get; set; }

        public SiloMengeHist(DateTime _termin, double _menge, string _label)
        {
            Label = _label;
            Termin = _termin;
            Menge = _menge;
        }

        /// <summary>
        /// Erstellt aus den Stings einen DateTime Termin und eine double Menge. 
        /// Formatierung für _termin dd.MM.yyyy HH:mm:ss
        /// </summary>
        /// <param name="_termin"></param>
        /// <param name="_menge"></param>
        public SiloMengeHist(string _termin, string _menge, string _label)
        {
            Label = _label;
            Termin = DateTime.ParseExact(_termin, "dd.MM.yyyy HH:mm:ss", System.Globalization.CultureInfo.InvariantCulture); 
            Menge = double.Parse(_menge);

        }

    }
}

actually i had a control ultradatachart, in this control add 6 series, and in the same time this series feed other control (ultralegend), if you see is 2 controls individual, i want create o manage only 1 control (ultradatachart) and inside this control i wan to see the graphic of 6 series, and additional the legend, i want see the legend on right top of ultradatachart

that method is only for fill a dataset 

private DataSet CreateCharts2()
{
//var query = "select WeekEnding,LastYrCumLIT,ThisYrCumLIT,LastYrCumMPR,ThisYrCumMPR,LastYrCumMS,ThisYrCumMS," +
// "LastYrLIT,ThisYrLIT,LastYrMPR,ThisYrMPR,LastYrMS,ThisYrMS from mktweeklystats";
var query = "select CONVERT(VARCHAR(10), wk_nm, 103) as wk_nm," +
"ms_this_year as ms_this_year_client," +
"ms_last_year as ms_last_year_client," +
"lit_this_year as lit_this_year_client," +
"lit_last_year as lit_last_year_client," +
"mpr_this_year as mpr_this_year_client," +
"mpr_last_year as mpr_last_year_client," +
"all_this_year as all_this_year_client," +
"all_last_year as all_last_year_client " +
"from angelod1" +
";select CONVERT(VARCHAR(10), wk_nm, 103) as wk_nm," +
"ms_this_year as ms_this_year_nonclient," +
"ms_last_year as ms_last_year_nonclient," +
"lit_this_year as lit_this_year_nonclient," +
"lit_last_year as lit_last_year_nonclient," +
"mpr_this_year as mpr_this_year_nonclient," +
"mpr_last_year as mpr_last_year_nonclient," +
"all_this_year as all_this_year_nonclient," +
"all_last_year as all_last_year_nonclient " +
"from angelod2" +
";select CONVERT(VARCHAR(10), wk_nm, 103) as wk_nm," +
"ms_this_year as ms_this_year_all," +
"ms_last_year as ms_last_year_all," +
"lit_this_year as lit_this_year_all," +
"lit_last_year as lit_last_year_all," +
"mpr_this_year as mpr_this_year_all," +
"mpr_last_year as mpr_last_year_all," +
"all_this_year as all_this_year_all," +
"all_last_year as all_last_year_all " +
"from angelod3";
DataSet oData = GetData(query);
return oData;

}