how to make Grid View Header as Static in asp.net

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ASP.NET

I m creating an application in which i used gridview. In gridview i used panel to scroll data but it also scroll header of gridview. i want only data of gridview is scroll not header. below i m given source code of gridview.

<asp:Panel ID ="grid_panel" runat ="server"   Height="250px"  Width ="800px"   ScrollBars="Vertical">
    <asp:GridView ID="grdCounterList" Width="780px" runat="server"
            RowStyle-HorizontalAlign="Center"  BorderWidth="1px"
        AutoGenerateColumns="False"
            OnRowDataBound="grdCounterList_RowDataBound"
            onselectedindexchanged="grdCounterList_SelectedIndexChanged"
            BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" CellPadding="3">
<RowStyle HorizontalAlign="Center" ForeColor="#000066"></RowStyle>
         <Columns>
             <asp:TemplateField HeaderText="Counter Name">
                <HeaderStyle Height="18px" HorizontalAlign="center" CssClass="gridheader"/>
                <ItemStyle  Width="25%" HorizontalAlign="Center"/>
                <ItemTemplate>
                    <asp:TextBox id="txtCounter" runat="server" Columns="25"  CssClass="textbox"  Text=" "   ></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Status" HeaderStyle-Width="70px" >
                <HeaderStyle HorizontalAlign="center" CssClass="gridheader"/>
                <ItemStyle  Width="10%" HorizontalAlign="center"/>
                <ItemTemplate>
                    <asp:CheckBox ID="chkActive" runat="server" ToolTip='<%# Bind("Counter_id") %>' Text="Active" CssClass="checkbox" />
                </ItemTemplate>
            </asp:TemplateField>

            <asp:TemplateField HeaderText="Default Counter" >
                <HeaderStyle Height="20px" HorizontalAlign="center" CssClass="gridheader"/>
                <ItemStyle  Width="20%"  HorizontalAlign="center" />
                <ItemTemplate>
                    <asp:CheckBox ID="chkDefault" runat="server" ToolTip='<%# Bind("Counter_id") %>' Text="Default" CssClass="checkbox" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Payment Mode" >
                <HeaderStyle Height="20px" HorizontalAlign="center"  CssClass="gridheader"/>
                <ItemStyle   Width="20%"  HorizontalAlign="center" />
                <ItemTemplate>
                   <asp:RadioButtonList  ID="radPaymentMode" runat="server"  CssClass="radiobutton" TextAlign="Left"  >

                   </asp:RadioButtonList>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Swipe Machine" >
                <HeaderStyle Height="20px" HorizontalAlign="center"  CssClass="gridheader"/>
                <ItemStyle   Width="20%"  HorizontalAlign="center" />
                <ItemTemplate>
                   <asp:CheckBoxList ID="chkMachine" runat="server" AutoPostBack="true" CssClass="checkbox"  OnSelectedIndexChanged="chkMachine_SelectedIndexChanged">

                    </asp:CheckBoxList>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Menu Items" >
                <HeaderStyle Height="20px" HorizontalAlign="center"  CssClass="gridheader"/>
                <ItemStyle   Width="20%"  HorizontalAlign="center" />
                <ItemTemplate>

                   <asp:Button ID="btnMenus" runat="server" Text="Add Menu"

                      ForeColor="White"    BackColor="#205d9c"  OnClick="btnMenus_Click" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
         <FooterStyle BackColor="White" ForeColor="Black" />
        <PagerStyle HorizontalAlign="Left" BackColor="White" ForeColor="BLACK" />
         <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="Black" />
         <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="Black" />
           <AlternatingRowStyle  BackColor ="#f8f8f8"  />
    </asp:GridView>
    </asp:Panel>