DataGridView Custom Headers in VB.NET

/* ================================================================ 
This copyright notice must be kept untouched in the stylesheet at 
all times.

The original version of this stylesheet and the associated (x)html
is available at http://www.cssplay.co.uk/menus/pro_variable4.html
Copyright (c) 2005-2007 Stu Nic.navbarholls. All rights reserved.
This stylesheet and the associated (x)html may be modified in any 
way to fit your requirements.
=================================================================== */
.navbar a, 
#nav {padding:0 0 0 0px; margin:0; list-style:none; font: 10pt verdana, sans-serif; position:relative; z-index:200; height:24px;}
 
.navbar,
#nav ul {padding:0; margin:0; list-style:none; float:left; background:#488E00; border-top:1px solid #488E00; border-color:#488E00 #488E00 #488E00 #488E00;}


#nav li {float:left;}
#nav li li {float:none; border-left:1px solid #488E00; border-right:1px solid #488E00; }
#nav li li.last {border-bottom:1px solid #488E00; }

* html #nav li li {float:left;} /* a hack for  IE6 */
.navbar { border-style:none;}

.navbar a,
#nav li a {display:block; float:left; color:#fff; height:24px;  padding:0 12px 0 12px; line-height:24px; text-decoration:none; white-space:nowrap; font-weight:bold;}
#nav li a.down {}

#nav li li a {display:block; float:none; height:22px; line-height:22px; padding:0 5px 0 5px; font-weight:normal; letter-spacing:0px;}
#nav li li a.fly {}

.navbar a:hover,
#nav li:hover {position:relative; z-index:300;background-color: #C3DE6C;}
.navbar a:hover,
#nav li.cssplay_hover {position:relative; z-index:300; background-color: #C3DE6C;}
#nav li.cssplay_hover a {color:#000; background-color: #C3DE6C; }

#nav li li a {color:#fff;font-weight:bold;}
#nav li li.cssplay_hover a {color:#fff;font-weight:bold;}

#nav li:hover ul {left:0; top:24px; z-index:500;}
#nav li.cssplay_hover ul {left:0; top:24px; z-index:500;}

#nav ul {position:absolute; left:-9999px; top:-9999px;}

* html #nav ul {width:2px;}

#nav li:hover li:hover > ul {left:-5px; margin-left:100%; top:-1px; z-index:500;}
#nav li:hover > ul ul {position:absolute; left:-9999px; top:-9999px; width:auto; }

#nav li:hover > a {color:#000 !important;background-color:#C3DE6C !important;font-weight:bold;}
#nav li li:hover > a {color:#000 !important; background-color:#C3DE6C !important;font-weight:bold;}

#nav li li a,
#nav li li li a,
#nav li li li li a,
#nav li li li li li a,
#nav li li li li li li a
{color:#fff !important; background-color:#488E00 !important; font-weight:bold; }


.navbar a:hover,
#nav li.cssplay_hover li.cssplay_hover a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover a
{color:#000 !important; background-color:#C3DE6C !important; font-weight:bold;}

#nav li.cssplay_hover li.cssplay_hover li a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li a,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li a
{color:#000 !important; background-color:#C3DE6C !important;font-weight:bold;}

#nav li.cssplay_hover li.cssplay_hover ul,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover ul,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover ul,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover ul
{left:100%; margin-left:-5px; top:-1px;}

#nav li.cssplay_hover ul ul,
#nav li.cssplay_hover li.cssplay_hover ul ul,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover ul ul,
#nav li.cssplay_hover li.cssplay_hover li.cssplay_hover li.cssplay_hover ul ul
{position:absolute; left:-9999px; top:-9999px;}