private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			ListBox lb1 = (sender as ListBox);
			ListBox lb2 = this.listBox2;
			if (lb1.SelectedIndex != -1 && !(lb1.SelectedIndex > (lb2.Items.Count - 1)))
			{
				lb2.SelectedIndex = lb1.SelectedIndex;
			}
		}