Steema Central

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public static System.IO.MemoryStream tmpChart;
    private static int index = -1;
    private static bool flag = true;
    private static System.Collections.ArrayList checkedSeries;

    protected void Page_Load(object sender, EventArgs e)
    {
        Steema.TeeChart.Chart ch1;
        if (flag)
        {
            ch1 = WebChart1.Chart;
            ch1.Legend.CheckBoxes = true;
            ch1.Series.Add(new Steema.TeeChart.Styles.Line());
            ch1.Series.Add(new Steema.TeeChart.Styles.Line());
            ch1.Series.Add(new Steema.TeeChart.Styles.Line());
            ch1.Series.Add(new Steema.TeeChart.Styles.Line());
            checkedSeries = new System.Collections.ArrayList();
            for (int i = 0; i < ch1.Series.Count; ++i)
            {
                ch1[i].FillSampleValues();
                CheckedSeries chk = new CheckedSeries(ch1[i].Active, i);
                checkedSeries.Add(chk);

            }
            tmpChart = new System.IO.MemoryStream();
            ch1.Export.Template.Save(tmpChart);
            WebChart1.ClickLegend +=new Steema.TeeChart.Web.WebChart.ClickEventHandler(WebChart1_ClickLegend);
            flag = false;
        }
        else
        {
            ch1 = WebChart1.Chart;
            tmpChart.Position = 0;
            ch1.Import.Template.Load(tmpChart);
            WebChart1.ClickLegend += new Steema.TeeChart.Web.WebChart.ClickEventHandler(WebChart1_ClickLegend);
        }
    }
    protected void WebChart1_ClickLegend(object sender, ImageClickEventArgs e)
    {
        index = WebChart1.Chart.Legend.Clicked(e.X, e.Y);
        if (index != -1)
        {
            CheckedSeries chk = (CheckedSeries)checkedSeries[index];
            chk.IsActive = !chk.IsActive;
            checkedSeries.RemoveAt(chk.Index);
            checkedSeries.Insert(chk.Index, chk);
            System.Drawing.Bitmap bmp = WebChart1.Chart.Bitmap();
        }
    }
    protected void WebChart1_BeforeDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
    {
        for (int i = 0; i < WebChart1.Chart.Series.Count; ++i)
        {
            CheckedSeries chk = (CheckedSeries)checkedSeries[i];
            WebChart1.Chart[i].Active = chk.IsActive;
        }
    }

    public struct CheckedSeries
    {
        public CheckedSeries(bool isActive, int index)
        {
            IsActive = isActive;
            Index = index;
        }
        public bool IsActive;
        public int Index;