DataGrid上下滚动标题不动，左右联动

    <style type="text/css">
        .DataGridFixedHeader {
            position: relative;
            top: expression(this.offsetParent.scrollTop);
            background-color: blue
        }
    </style>

<HeaderStyle CssClass="ms-formlabel DataGridFixedHeader" BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />