Grid with Image button onclick doesnot fire?

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C#3.5

this is my code

<div>
        <asp:ScriptManager ID="ScriptManager1" runat="server"

EnablePartialRendering="true">
        </asp:ScriptManager>
         <asp:UpdateProgress ID="UpdateProgress1" runat="server">
        <ProgressTemplate>
       <%-- <img src="Images/Loading.gif" alt="" />--%>
        </ProgressTemplate>
        </asp:UpdateProgress>

    <asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional" >
   <ContentTemplate>

       <asp:GridView ID="gvDetails" runat="server" AutoGenerateColumns="false"
        CssClass="Gridview"
        HeaderStyle-BackColor="#61A6F8" HeaderStyle-Font-Bold="true"
        HeaderStyle-ForeColor="White"
        ShowFooter="true" AllowPaging="True" onpageindexchanging="OnPaging"
        PageSize="5">
        <Columns>
        <asp:TemplateField HeaderStyle-HorizontalAlign="Left" HeaderText="RecNo">


                <ItemTemplate>
                    <asp:Label ID="lblRecNo" runat="server" Text='<%#Eval("RecNo")

%>' />
                </ItemTemplate>
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>
            <asp:TemplateField HeaderStyle-HorizontalAlign="Left"

HeaderText="TType">
                <ItemTemplate>
                    <asp:Label ID="lblTType" runat="server" Text='<%#Eval("TType")

%>' />
                </ItemTemplate>
                <FooterTemplate>
                    <asp:DropDownList ID="DropftrTType" Width="75px"

runat="server">
                    </asp:DropDownList>
                </FooterTemplate>
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>
            <asp:TemplateField HeaderStyle-HorizontalAlign="Left" HeaderText="Op">


                <ItemTemplate>
                    <asp:Label ID="lblOp" runat="server" Text='<%#Eval("Op") %>' />
                </ItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtftrOp" Width="75px" onkeydown="return

jsDecimals(event);" onblur=""  AutoPostBack="true"  runat="server" />


                </FooterTemplate>
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>
            <asp:TemplateField HeaderStyle-HorizontalAlign="Left" HeaderText="Cl">


                <ItemTemplate>
                    <asp:Label ID="lbllname" runat="server" Text='<%#Eval("Cl") %>'

/>
                </ItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtftrCl" Width="75px" onkeydown="return

jsDecimals(event);"  AutoPostBack="true" runat="server" />
                </FooterTemplate>
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>


            <asp:TemplateField HeaderStyle-HorizontalAlign="Left"

HeaderText="Date">
                <ItemTemplate>
                    <asp:Label ID="lblDesg" runat="server" Text='<%#Eval("Date")%>' />
                </ItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtftrDate" width="75px" runat="server" />


                </FooterTemplate>
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>


            <asp:TemplateField HeaderStyle-HorizontalAlign="Left"

HeaderText="Total">
                <ItemTemplate>
                    <asp:Label ID="lblDesg"  runat="server" Text='<%#Eval("Total")

%>' />
                </ItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtftrTotal" width="75px" runat="server" />


                </FooterTemplate>
                <HeaderStyle HorizontalAlign="Left" />
            </asp:TemplateField>

            <asp:TemplateField>
                <ItemTemplate>
                    <a id="popup" href="EditTickets.aspx?RecNo=<%# Eval("RecNo")%>&TType=<%#Eval("TType")%>&Op=<%#Eval("Op")%>&Cl=<%#Eval("Cl")%>&Date=<%#Eval("Date")%>&Total=<%#Eval("Total") %>""><%--"'EditTickets.aspx?RecNo=<%# Eval("RecNo") %>'"--%>
                    Edit</a>
                </ItemTemplate>
                <FooterTemplate>
                    <asp:ImageButton ID="imgbtnAdd" OnClick="AddNewCustomer" runat="server" Height="30px" ImageUrl="~/Images/AddNewitem.jpg" ToolTip="Add new User" ValidationGroup="validaiton"


Width="30px" />
                </FooterTemplate>
            </asp:TemplateField>
        </Columns>
        <HeaderStyle BackColor="#61A6F8" Font-Bold="True" ForeColor="White" />
    </asp:GridView>
          <asp:Button ID="btnRefresh" Text="refresh" runat="server" style="display:none" />
   </ContentTemplate>
   <%--<Triggers>
       <asp:AsyncPostBackTrigger ControlID="btnRefresh" EventName="Click" />
   </Triggers>--%>
 </asp:UpdatePanel>
    </div>

protected void AddNewCustomer(object sender, EventArgs e)// this function does not fire
{
string qry = "insert into Tbl_Bus_TicketChild values(";
string v1, v2, v3, v4, v5, v6;
v1 = Convert.ToInt32(TextBox1.Text.Trim()).ToString();
if (((DropDownList)gvDetails.FooterRow.FindControl("DropftrTType")).SelectedIndex > 0)
{
v2 = ((DropDownList)gvDetails.FooterRow.FindControl("DropftrTType")).Text;
}
else
{
((DropDownList)gvDetails.FooterRow.FindControl("DropftrTType")).SelectedIndex = 1;
v2 = ((DropDownList)gvDetails.FooterRow.FindControl("DropftrTType")).Text;
}
v3 = (((TextBox)gvDetails.FooterRow.FindControl("txtftrOp")).Text.Length > 0) ? ((TextBox)gvDetails.FooterRow.FindControl("txtftrOp")).Text : "0";
v4 = (((TextBox)gvDetails.FooterRow.FindControl("txtftrCl")).Text.Length > 0) ? ((TextBox)gvDetails.FooterRow.FindControl("txtftrCl")).Text : "0";
v5 = (TextBox2.Text.Length > 0) ? TextBox2.Text : "1/1/1990";
v6 = (((TextBox)gvDetails.FooterRow.FindControl("txtftrTotal")).Text.Length > 0) ? ((TextBox)gvDetails.FooterRow.FindControl("txtftrTotal")).Text : "0";
qry = qry + Convert.ToInt32(v1) + ",";
qry = qry + "'" + v2 + "',";
qry = qry + Convert.ToDecimal(v3) + ",";
qry = qry + Convert.ToDecimal(v4) + ",";
qry = qry + "'" + v5 + "',";
qry = qry + Convert.ToDecimal(v6) + ")";
cmd = new SqlCommand(qry, con);
cmd.ExecuteNonQuery();
cmd.Dispose();
BindGridView();
LoadDropDown();
}


regards
sarva