Thanks for getting back to me so soon, that works fine.

Again, your strategy will have to vary a bit depending on your chart type, but how does this work for you?

        private void theChart_DataItemMouseLeftButtonDown(
            object sender, DataItemMouseEventArgs e)
        {
            DataPointTemplate template = 
                e.Element as DataPointTemplate;

            if (template != null)
            {
                DataPoint point = template.DataPoint;
                ObservableCollection<TestSampleData> dataSource =
                    template.Series.DataSource as
                    ObservableCollection<TestSampleData>;

                int index = 
                    template.Series.DataPoints.IndexOf(point);
                if (index >= 0 && dataSource != null)
                {
                    MessageBox.Show(dataSource[index].Label);
                }
            }
        }

-Graham

Thanks for the fast response. This allows me to get the data point I am bound to, but how do I obtain the object that produced this binding? Its very straight forward to do this using the control toolkit charts. Heres how I am binding the series (on clicking a node I need to get my cell object so I can use the meta data to build a drill down query):

                    s.DataSource = dataSource.RowCellCollection as IEnumerable;
                    s.Label = dataSource.SeriesItem.Caption;

                    /* Setup the bindings configured in the attached properties */
                    s.DataMapping = String.Format("Value={0};Label={1};", DependentValueBinding, "Caption"); // noticed that binding can't deal with x.y properties so had to add property to rowcell class to access cell meta data
                    s.DataBind();