How to display the summary values of the WinForms GridGroupingControl in the essential chart?

//Hooking the GroupedColumn changes and RecordValueChanged events in the Form_Load
this.gridGroupingControl1.TableDescriptor.GroupedColumns.Changed += new Syncfusion.Collections.ListPropertyChangedEventHandler(GroupedColumns_Changed);
this.gridGroupingControl1.RecordValueChanged += new RecordValueChangedEventHandler(gridGroupingControl1_RecordValueChanged);

//Changes the Chart data
private void GroupedColumns_Changed(object sender, Syncfusion.Collections.ListPropertyChangedEventArgs e)
{
   SetChartData();
}

//Need to delay the update slightly so the summary value is available
private Timer t = null;
private void gridGroupingControl1_RecordValueChanged(object sender, RecordValueChangedEventArgs e)
{
   if(t == null)
   {
      t = new Timer();
      t.Interval = 20;
      t.Tick += new EventHandler(t_Tick);
   }
   t.Start();
}

private void t_Tick(object sender, EventArgs e)
{
   Timer t = sender as Timer;
   t.Stop();
   SetChartData();
}

'Hooking the GroupedColumn changes and RecordValueChanged events in the Form_Load
AddHandler Me.gridGroupingControl1.TableDescriptor.GroupedColumns.Changed, AddressOf GroupedColumns_Changed
AddHandler Me.gridGroupingControl1.RecordValueChanged, AddressOf gridGroupingControl1_RecordValueChanged

'Changes the Chart data
Private Sub GroupedColumns_Changed(ByVal sender As Object, ByVal e As Syncfusion.Collections.ListPropertyChangedEventArgs)
    SetChartData()
End Sub

'Need to delay the update slightly so the summary value is available
Private t As Timer = Nothing
Private Sub gridGroupingControl1_RecordValueChanged(ByVal sender As Object, ByVal e As RecordValueChangedEventArgs)
    If t Is Nothing Then
        t = New Timer()
        t.Interval = 20
        AddHandler t.Tick, AddressOf t_Tick
    End If
    t.Start()
End Sub

Private Sub t_Tick(ByVal sender As Object, ByVal e As EventArgs)
    Dim t As Timer = TryCast(sender, Timer)
    t.Stop()
    SetChartData()
End Sub

private void SetChartData()
{
    int numPoints = this.gridGroupingControl1.Table.TopLevelGroup.Groups.Count;
    try
    {
        ChartSeries series = new ChartSeries();
        double yMax = double.MinValue;
        double yMin = double.MaxValue;
        double xMin = double.MaxValue;
        double xMax = double.MinValue;
        for (int j = 0; j < numPoints; j++)
        {
            Group g = this.gridGroupingControl1.Table.TopLevelGroup.Groups[j];
            double x;
            double y;
            if (double.TryParse(g.Category.ToString(), System.Globalization.NumberStyles.Any, null, out x) && double.TryParse(GridEngine.GetSummaryText(g, this.scd), System.Globalization.NumberStyles.Any, null, out y))
            {
                series.Points.Add(x, y);
                if (y < yMin)
                    yMin = y;
                if (y > yMax)
                    yMax = y;
                if (x < xMin)
                    xMin = x;
                if (x > xMax)
                    xMax = x;
            }
        }
        this.chartControl1.Indexed = false;
        this.chartControl1.ZoomFactorX = 1;
        this.chartControl1.ZoomFactorY = 1;
        this.chartControl1.PrimaryXAxis.DrawGrid = false;
        this.chartControl1.PrimaryYAxis.DrawGrid = false;
        this.chartControl1.PrimaryYAxis.RangeType = ChartAxisRangeType.Set;
        this.chartControl1.PrimaryYAxis.Range.Max = yMax;
        this.chartControl1.PrimaryYAxis.Range.Min = yMin;
        this.chartControl1.PrimaryYAxis.Range.Interval = (yMax - yMin) / 4;
        this.chartControl1.PrimaryYAxis.Font = new Font(this.Font.Name, 8);
        this.chartControl1.PrimaryXAxis.RangeType = ChartAxisRangeType.Set;
        this.chartControl1.PrimaryXAxis.Range.Max = xMax;
        this.chartControl1.PrimaryXAxis.Range.Min = xMin;
        this.chartControl1.PrimaryXAxis.Range.Interval = 2;
        this.chartControl1.Legend.Visible = false;
        series.Type = ChartSeriesType.Line;
        series.Style.DisplayShadow = false;
        this.chartControl1.Series.Add(series);
        this.chartControl1.Redraw(true);
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

Private Sub SetChartData()
    Dim numPoints As Integer = Me.gridGroupingControl1.Table.TopLevelGroup.Groups.Count
    Try
        Dim series As New ChartSeries()
        Dim yMax As Double = Double.MinValue
        Dim yMin As Double = Double.MaxValue
        Dim xMin As Double = Double.MaxValue
        Dim xMax As Double = Double.MinValue
        For j As Integer = 0 To numPoints - 1
            Dim g As Group = Me.gridGroupingControl1.Table.TopLevelGroup.Groups(j)
            Dim x As Double
            Dim y As Double
            If Double.TryParse(g.Category.ToString(), System.Globalization.NumberStyles.Any, Nothing, x) AndAlso Double.TryParse(GridEngine.GetSummaryText(g, Me.scd), System.Globalization.NumberStyles.Any, Nothing, y) 
                series.Points.Add(x, y)
                If y < yMin Then
                    yMin = y
                End If
                If y > yMax Then
                    yMax = y
                End If
                If x < xMin Then
                    xMin = x
                End If
                If x > xMax Then
                    xMax = x
                End If
            End If
        Next j
        Me.chartControl1.Indexed = False
        Me.chartControl1.ZoomFactorX = 1
        Me.chartControl1.ZoomFactorY = 1
        Me.chartControl1.PrimaryXAxis.DrawGrid = False
        Me.chartControl1.PrimaryYAxis.DrawGrid = False
        Me.chartControl1.PrimaryYAxis.RangeType = ChartAxisRangeType.Set
        Me.chartControl1.PrimaryYAxis.Range.Max = yMax
        Me.chartControl1.PrimaryYAxis.Range.Min = yMin
        Me.chartControl1.PrimaryYAxis.Range.Interval = (yMax - yMin) / 4
        Me.chartControl1.PrimaryYAxis.Font = New Font(Me.Font.Name, 8)
        Me.chartControl1.PrimaryXAxis.RangeType = ChartAxisRangeType.Set
        Me.chartControl1.PrimaryXAxis.Range.Max = xMax
        Me.chartControl1.PrimaryXAxis.Range.Min = xMin
        Me.chartControl1.PrimaryXAxis.Range.Interval = 2
        Me.chartControl1.Legend.Visible = False
        series.Type = ChartSeriesType.Line
        series.Style.DisplayShadow = False
        Me.chartControl1.Series.Add(series)
        Me.chartControl1.Redraw(True)
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    End Try
End Sub