if (e.Node.Level == 1) //child
			{
				switch (e.Node.Parent.Tag.ToString())
				{
					case "1":
						e.Node.Cells[1].Appearance.BackColor = Color.BlueViolet;
						break;
					case "2":
						e.Node.Cells[1].Appearance.BackColor = Color.Blue;
						break;
					case "3":
						e.Node.Cells[1].Appearance.BackColor = Color.Violet;
						break;
				}
			}
			else if (e.Node.Level == 2) //grandchild
			{
				switch (e.Node.Parent.Parent.Tag.ToString())
				{
					case "1":
						e.Node.Cells[1].Appearance.BackColor = Color.Red;
						break;
					case "2":
						e.Node.Cells[1].Appearance.BackColor = Color.Magenta;
						break;
					case "3":
						e.Node.Cells[1].Appearance.BackColor = Color.MediumVioletRed;
						break;
				}
			}