My Env: Visual Studio 2008  SP1  with .NetFramework3.5SP1

And Infragistics3.Wpf.Chart.v8.1

OS: Win 2003 EE SP2

 Problem: the tooltip is not shown correctly.  Please check. 

Note that only the first statck on the left is correctly shown the tooltip and the later  tooltips are the same one

which showing the  last series' datapoint's tooltip.

XAML:

<Window x:Class="WpfApplication12.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:igChart="http://infragistics.com/Chart"
    Title="Window1" Height="600" Width="600">
    <Grid>
       
        <igChart:XamChart Name="chart">
            <igChart:XamChart.Series>
                <igChart:Series ChartType="StackedColumn"></igChart:Series>
            </igChart:XamChart.Series>
        </igChart:XamChart>
       
    </Grid>
</Window>

Code behind:

public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            loadData();

        }

        private void loadData()
        {
            TestData[] td = new TestData[91];

            for (int i = 0; i < td.Length; i++)
            {
                List<TestInnerData> list = new List<TestInnerData>();

                for (int j = 10; j >= 0; j--)
                {
                    list.Add(new TestInnerData() { Date = DateTime.Now.AddDays(-j), Amount = 100000 });

                }

                td[i] = new TestData() { Host = "myhost-w2k3s-" + i, DataForHost = list };
            }

            chart.Series.Clear();

            for (int i = 0; i < td.Length; i++)
            {
                string branchServerName = td[i].Host;

                Series mySeries = new Series()
                {
                    ChartType = ChartType.StackedColumn,                  
                    Label = branchServerName
                };

                foreach (TestInnerData data in td[i].DataForHost)
                {
                    DataPoint dp = new DataPoint()
                    {
                        Label =data.Date.ToString("MMM dd"),
                        Value = data.Amount,
                        ToolTip = null
                    };

                    dp.ToolTip = string.Format(branchServerName + ":{0}", dp.Value);

                    mySeries.DataPoints.Add(dp);
                }

                chart.Series.Add(mySeries);
            }
       
        }

        public class TestData
        {
            public String Host
            {
                get;
                set;
            }

            public List<TestInnerData> DataForHost
            {
                get;
                set;
            }       
         
        }

        public class TestInnerData
        {

            public DateTime Date
            {
                get;
                set;
            }

            public double Amount
            {
                get;
                set;
            }
        }
    }