Better DataGrid Column Header ToolTips

using System;
using System.Web.UI.WebControls;

namespace samplewebapp
{
	public class CustomDataGrid : DataGrid
	{
		private const string HEADER_TOOLTIP_FORMAT = @"<p title=""{0}"">{1}</p>";

		/// <summary>
		/// Adds tooltip capability to column headers
		/// </summary>
		/// <param name="e">DataGridItemEventArgs</param>
		protected override void OnItemCreated(DataGridItemEventArgs e)
		{
			if(e.Item.ItemType == ListItemType.Header) 
			{ 
				for (int i=0;i < e.Item.Cells.Count;i++) 
				{
					if (Columns[i] is CustomBoundColumn) 
					{
						CustomBoundColumn col = (CustomBoundColumn)Columns[i];

						if (col.HeaderToolTip != null) 
						{
							TableCell cell = e.Item.Cells[i];
							cell.Text = String.Format(HEADER_TOOLTIP_FORMAT,col.HeaderToolTip,cell.Text);
						}
					}
				}	
			}

			//invoke base class method
			base.OnItemCreated (e);
		}
	}
}