Steema Central

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            tChart1.Legend.CheckBoxes = true;

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;

namespace LegendCheckboxes
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected Steema.TeeChart.Web.WebChart WebChart1;
		public static MemoryStream tmpChart;
		private static int index = -1;
		private static bool flag=true;
		private static ArrayList checkedSeries;

		private void Page_Load(object sender, System.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 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 MemoryStream();
				ch1.Export.Template.Save(tmpChart);
			
				flag = false;
			}
			else 
			{
				ch1=WebChart1.Chart;
				tmpChart.Position = 0;
				ch1.Import.Template.Load(tmpChart);
			}
		}

		private void WebChart1_ClickLegend(object sender, System.Web.UI.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); 
				Bitmap bmp = WebChart1.Chart.Bitmap();
			}
		}

		private 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;
			}
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{   
			this.WebChart1.ClickLegend += new Steema.TeeChart.Web.WebChart.ClickEventHandler(this.WebChart1_ClickLegend);
			this.WebChart1.BeforeDraw += new Steema.TeeChart.PaintChartEventHandler(this.WebChart1_BeforeDraw);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

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