IE8.0高速模式下设置Gridview头部居左无效？？

在页面中使用了一个gridview，设置头部居左，在IE兼容模式下木有问题，在高速模式下就居中了。前台代码如下：



		    <asp:GridView runat="server" ID="thread_gv" AutoGenerateColumns="False" BackColor="White" DataKeyNames="TID" ShowHeader="true"

		     BorderColor="#DEDFDE" Width="720px" BorderWidth="1px" CellPadding="4" ForeColor="Black" HeaderStyle-HorizontalAlign="Left" 

		     GridLines="Horizontal" AllowPaging="True"  PageSize="20"  OnRowDataBound="thread_gv_RowDataBound" OnPageIndexChanging="thread_gv_PageIndexChanging" >	       

		       <Columns>

                     <asp:HyperLinkField HeaderText="主题" DataNavigateUrlFields="SUBJECT,FID,TID" ControlStyle-Width="270px"

                        DataNavigateUrlFormatString="BBSArticle.aspx?forumid={1}&threadid={2}&pageid=0" Target="mainframe" NavigateUrl="~/BBSArticle.aspx"

                        DataTextField="SUBJECT" SortExpression="TID">

                     </asp:HyperLinkField>

                     <asp:HyperLinkField HeaderText="作者" Text="姓名" DataNavigateUrlFields="USERNAME"

                        DataNavigateUrlFormatString="#" Target="mainframe" NavigateUrl="~/BBSArticle.aspx"

                        DataTextField="USERNAME" SortExpression="USERNAME">

                         <ControlStyle CssClass="BBSColumns" />

                     </asp:HyperLinkField>         

                     <asp:BoundField AccessibleHeaderText="回复" DataField="hot" HeaderText="回复/阅览"

                         SortExpression="hot" />

                     <asp:BoundField AccessibleHeaderText="最后回复" DataField="LASTPOST" HeaderText="最后回复"

                         SortExpression="LASTPOST" /> 

                 </Columns>

                 <RowStyle BackColor="White" Height="30px" HorizontalAlign="Left" VerticalAlign="Bottom"/>

                 <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />

                 <PagerStyle BackColor="#76AC30" ForeColor="Black" HorizontalAlign="Left" BorderStyle="None" Font-Underline="True"/>

                 <HeaderStyle  BackColor="#76AC30" Font-Bold="False" ForeColor="White" Height="30px" HorizontalAlign="Left" VerticalAlign="Middle" />

		         <AlternatingRowStyle BackColor="#F6F7F9"/>

		    </asp:GridView>

--------------------编程问答--------------------

<HeaderStyle  BackColor="#76AC30" Font-Bold="False" ForeColor="White" Height="30px" HorizontalAlign="Left" VerticalAlign="Middle" />

这个地方是设置为Left了啊，为啥IE高速模式下就居中了呢？
另外：有些网站也没有高速模式那个按钮，是不是在网站里设置其不能再高速模式下运行呢？？
在线等各位大神回答 --------------------编程问答--------------------

--------------------编程问答--------------------            <asp:GridView runat="server" ID="thread_gv" AutoGenerateColumns="False" BackColor="White" DataKeyNames="TID" ShowHeader="true"
             BorderColor="#DEDFDE" Width="720px" BorderWidth="1px" CellPadding="4" ForeColor="Black" HeaderStyle-HorizontalAlign="Left"              GridLines="Horizontal" AllowPaging="True"  PageSize="20"  OnRowDataBound="thread_gv_RowDataBound" OnPageIndexChanging="thread_gv_PageIndexChanging" >


HeaderStyle-HorizontalAlign="Left"
这个去掉试试

补充：.NET技术 ,  ASP.NET

IE8.0高速模式下 设置Gridview头部居左无效？？

IE8.0高速模式下设置Gridview头部居左无效？？