Forms Data Controls :: Gridview Horizontal Scrollbar Not Coming?

i designed a gridview with HeaderStyle Freeze like this

<HeaderStyle CssClass="FreezeMe" Wrap="true" />
.FreezeMe
{
background: #ecf5ff;
color: #333;
background-color: #6D91BF;
border-style: solid;
border-width: 1px;
border-color: #9cc9ed #5c9fde #6daddb #b4d2f0;
font-weight: bold;
text-align: center;
color: white;
text-decoration: none;
font-size: 13px;
position: relative;
top: expression(this.offsetParent.scrollTop);
z-index: 10;;
height:40px;
font-size:30px;
}

i have applied my gridview within DIV tag because i need horizontal scrool bar(if no. of record is high) but i didnt see the scrollbar ...