How to get the control id present inside Ajax accordion.

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ASP.NET

Ajax

C#3.5

My design view is like this
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<asp:Accordion ID="acc" runat="server" SelectedIndex="0" EnableViewState="false"
OnItemDataBound="Accordion1_ItemDataBound" FadeTransitions="false" FramesPerSecond="40" TransitionDuration="250" AutoSize="None" RequireOpenedPane="false" SuppressHeaderPostbacks="true" HeaderCssClass="accordionHeader" HeaderSelectedCssClass="accordionHeaderSelected" ContentCssClass="accordionContent"> <contenttemplate> <asp:HiddenField ID="txt_categoryID" runat="server" Value='<%#DataBinder.Eval(Container.DataItem,"UDT_GSC_No") %>' /> <asp:GridView CssClass="GrdalternateItemStyle" ID="GridView1" > <columns> <asp:TemplateField HeaderStyle-HorizontalAlign="Left" HeaderText="Uploaded Certificates"> <itemtemplate> <%#DataBinder.Eval(Container.DataItem, "DTM_document_kdesc")%> <footertemplate> <asp:CheckBox ID="CheckBox1" runat="server" Text="Editional Documents To be Submitted" OnCheckedChanged="CheckBox1_CheckedChanged" AutoPostBack="true" /> <asp:TemplateField> <itemtemplate> <asp:ImageButton runat="server" ID="imgbtnView" ImageUrl="~/Images/lens.png"> <footertemplate> <asp:Button ID="Button1" CssClass="button" runat="server" Text="Verify" />
here i want "CheckBox1" id in code behind am trying something like this
***************************************************************************
GridView grd = new GridView();
grd = (GridView)acc.FindControl("GridView1");

CheckBox chk = (CheckBox)grd.FindControl("CheckBox1");

if (chk.Checked)
{
Panel1.Visible = true;
UpdatePanel1.Update();
}
else
{
Panel1.Visible = false;
UpdatePanel1.Update();
}
**************************************************************************
but its not working can any one please tell me how to solve this??

thanking you
(Keerthi Kumar)