当我在fire fox 7.0版中访问该表单时，这些选项卡不显示，并且该表单在所有其他浏览器中都运行良好。请解决这个问题。提前致谢。
以下是我的代码。
<form id="frmNewsManagement" runat="server" enctype="multipart/form-data">
<cc1:ToolkitScriptManager ID="ScriptManager1" runat="server">
</cc1:ToolkitScriptManager>
<asp:UpdatePanel ID="UDPMain" runat="server">
<ContentTemplate>
<div style="margin-left: 10px; margin-right: 10px;">
<cc1:TabContainer ID="TabContainer1" runat="server">
<cc1:TabPanel ID="tbpnlNewsManagement" runat="server">
<HeaderTemplate>
News Management
</HeaderTemplate>
<ContentTemplate>
<asp:UpdatePanel ID="UDPfirst" ChildrenAsTriggers="true" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<table class="FormTable">
<tr>
<td align="left" style="width: 50px">
<asp:Label ID="lblSelect" runat="server" Text="Select" SkinID="Label"></asp:Label>
</td>
<td>
<asp:DropDownList ID="cmbStatuses" runat="server" SkinID="DropDownList" OnSelectedIndexChanged="ddlSelect_SelectedIndexChanged"
AutoPostBack="true">
<asp:ListItem Text="Show Active" Value="0"></asp:ListItem>
<asp:ListItem Text="Show Deleted" Value="1"></asp:ListItem>
</asp:DropDownList>
</td>
</tr>
</table>
<asp:GridView ID="grdViewRecord" OnDataBound="grdViewRecord_DataBound" SkinID="gvwSilver"
AutoGenerateColumns="False" OnRowCommand="grdViewRecord_RowCommand" runat="server"
DataKeyNames="NEWSID" OnSorting="grdViewRecord_Sorting">
<Columns>
<asp:BoundField HeaderText="id" DataField="NEWSID" Visible="false" />
<asp:BoundField HeaderText="News Title" ItemStyle-Wrap="true" DataField="NEWSTITLE"
SortExpression="NEWSTITLE">
<HeaderStyle HorizontalAlign="Left" Font-Bold="True" />
<ItemStyle Width="200px" />
</asp:BoundField>
<asp:BoundField HeaderText="Date" DataField="NEWSDATE" ItemStyle-Wrap="true" SortExpression="NEWSDATE">
<HeaderStyle HorizontalAlign="Left" Font-Bold="True" />
<ItemStyle Width="100px" />
</asp:BoundField>
<asp:BoundField HeaderText="Department" ItemStyle-Wrap="true" DataField="DEPARTMENTNAME"
SortExpression="DEPARTMENTNAME">
<HeaderStyle HorizontalAlign="Left" Font-Bold="True" />
<ItemStyle Width="150px" />
</asp:BoundField>
<asp:BoundField HeaderText="Status" ItemStyle-Wrap="true" DataField="STATUSSHORTDESC"
SortExpression="STATUSSHORTDESC">
<HeaderStyle HorizontalAlign="Left" Font-Bold="True" />
<ItemStyle Width="100px" />
</asp:BoundField>
<asp:TemplateField HeaderText="Actions" HeaderStyle-HorizontalAlign="center" Visible="false">
<ItemTemplate>
<center>
<asp:ImageButton ID="btnEdit" ImageUrl="~/images/Icon/ico_edit.png" CommandArgument='<%# Eval("NEWSID") %>'
runat="server" CommandName="EditNews" Text="Edit" ToolTip="Edit News" />
<asp:ImageButton ID="btnDelete" ImageUrl="~/images/Icon/ico_delete.png" CommandArgument='<%# Eval("NEWSID") %>'
runat="server" CommandName="DeleteNews" Text="Delete" ToolTip="Delete News" />
</center>
</ItemTemplate>
<ItemStyle Width="25px" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Actions" HeaderStyle-HorizontalAlign="center" ItemStyle-Width="20px" Visible="false">
<ItemTemplate>
<center>
<asp:ImageButton ID="btnRestore" ImageUrl="~/images/Icon/restore.png" CommandArgument='<%# Eval("NEWSID") %>'
runat="server" CommandName="RestoreNews" Text="Restore" ToolTip="Restore News" />
</center>
</ItemTemplate>
<ItemStyle Width="25px" />
</asp:TemplateField>
</Columns>
<PagerTemplate>
<table border="0" width="100%">
<tr>
<td style="border: 0">
<asp:Label ID="lblTotalRecord" runat="server"></asp:Label>
</td>
<td style="float: right; border: 0">
<asp:TextBox ID="txtSearch" CssClass="totalPagesAlign" runat="server"></asp:TextBox>
<asp:ImageButton ID="btnSearch" runat="server" ImageUrl="~/Images/search.png" OnCommand="btnSearch_Command"
CommandArgument="Search" ToolTip="Search by news title" CommandName="Search"></asp:ImageButton>
<asp:ImageButton ID="imgPageFirst" runat="server" ImageUrl="~/Images/Icon/first.gif"
CommandArgument="First" ToolTip="First" CommandName="Page" OnCommand="imgPageFirst_Command">
</asp:ImageButton>
<asp:ImageButton ID="imgPagePrevious" runat="server" ImageUrl="~/Images/Icon/Prev.gif"
CommandArgument="Prev" ToolTip="Previous" CommandName="Page" OnCommand="imgPagePrevious_Command">
</asp:ImageButton>
<span class="totalPagesAlign">
<asp:Label ID="lblRecord" runat="server"></asp:Label>
<asp:Label ID="lblOf" runat="server" Text="of"></asp:Label>
<asp:Label ID="lblTotalPage" runat="server"></asp:Label>
</span>
<asp:ImageButton ID="imgPageNext" runat="server" ImageUrl="~/Images/Icon/next.gif"
CommandArgument="Next" ToolTip="Next" CommandName="Page" OnCommand="imgPageNext_Command"></asp:ImageButton>
<asp:ImageButton ID="imgPageLast" runat="server" ImageUrl="~/Images/Icon/Last.gif"
CommandArgument="Last" ToolTip="Last" CommandName="Page" OnCommand="imgPageLast_Command"></asp:ImageButton>
<asp:ImageButton ID="btnPageSize" ToolTip="Show five records" runat="server" ImageUrl="~/Images/Icon/5.gif" OnCommand="btnPageSize_Command">
</asp:ImageButton>
<asp:ImageButton ID="btnPageSize2" runat="server" ToolTip="Show ten records" ImageUrl="~/Images/Icon/10.gif"
OnCommand="btnPageSize2_Command"></asp:ImageButton>
<asp:ImageButton ID="btnPageSize3" runat="server" ToolTip="Show twenty records" ImageUrl="~/Images/Icon/20.gif"
OnCommand="btnPageSize3_Command"></asp:ImageButton>
<asp:ImageButton ID="btnPageSize4" runat="server" ToolTip="Show fifty records" ImageUrl="~/Images/Icon/50.gif"
OnCommand="btnPageSize4_Command"></asp:ImageButton>
</td>
</tr>
</table>
</PagerTemplate>
</asp:GridView>
<asp:Label ID="lblPopupTargetID" runat="server" Style="display: none;"></asp:Label>
<cc1:ModalPopupExtender ID="btnDelete_ModalPopupExtender" runat="server" PopupControlID="pnlDelete"
TargetControlID="lblPopupTargetID" BackgroundCssClass="ModalPopupBG" DynamicServicePath=""
Enabled="True" CancelControlID="btnDeleteCancel">
</cc1:ModalPopupExtender>
<asp:Panel ID="pnlDelete" runat="server" Style="display: none;">
<div class="popup_Container">
<div class="popup_Titlebar" id="PopupHeader">
<div class="TitlebarLeft">
Delete
</div>
<div class="TitlebarRight" onclick="btnDelete_ModalPopupExtender.Hide()">
</div>
</div>
<div class="popup_Body">
Are you sure, you want to Delete the record?
</div>
<div>
<center>
<asp:Button ID="btnDeleteOK" OnClick="btnDeleteOK_Click" runat="server" SkinID="Button"
Text="Ok" />
<asp:Button ID="btnDeleteCancel" runat="server" SkinID="Button" Text="Cancel" />
</center>
<br />
</div>
</div>
</asp:Panel>
<asp:Label ID="lblRestorePopupId" runat="server" Style="display: none;"></asp:Label>
<cc1:ModalPopupExtender ID="mdpopupRestore" runat="server" PopupControlID="pnlRestore"
TargetControlID="lblRestorePopupId" BackgroundCssClass="ModalPopupBG" DynamicServicePath=""
Enabled="True" CancelControlID="btnRestoreCancel">
</cc1:ModalPopupExtender>
<asp:Panel ID="pnlRestore" runat="server" Style="display: none;">
<div class="popup_Container">
<div class="popup_Titlebar" id="Div1">
<div class="TitlebarLeft">
Restore
</div>
<div class="TitlebarRight" onclick="btnDelete_ModalPopupExtender.Hide()">
</div>
</div>
<div class="popup_Body">
Are you sure, you want to Restore the record?
</div>
<div>
<center>
<asp:Button ID="btnRestoreOk" OnClick="btnRestoreOK_Click" runat="server" SkinID="Button"
Text="Ok" />
<asp:Button ID="btnRestoreCancel" runat="server" SkinID="Button" Text="Cancel" />
</center>
<br />
</div>
</div>
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="cmbStatuses" />
<asp:AsyncPostBackTrigger ControlID="grdViewRecord" EventName="RowCommand" />
<asp:AsyncPostBackTrigger ControlID="btnDeleteOK" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnDeleteCancel" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnRestoreOK" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnRestoreCancel" EventName="Click" />
<asp:PostBackTrigger ControlID="btnReport" />
</Triggers>
</asp:UpdatePanel>
<hr />
<asp:Button ID="btnAdd" SkinID="button" runat="server" Text="Add New" OnClick="btnAdd_Click" />
<asp:Button ID="btnReport" runat="server" Text="Report" SkinID="ReportButton" OnClick="btnReport_Click">
</asp:Button>
</ContentTemplate>
</cc1:TabPanel>
</cc1:TabContainer>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</form>
当我在fire fox 7.0版中访问该表单时，这些选项卡不显示，并且该表单在所有其他浏览器中都运行良好。请解决这个问题。