Problem with Expandable Gridview

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ASP.NET

I have created my Nested Gridview.

Instead of nested grid, I want to showing as expandable GridView. Please help me.

<blockquote class="FQ"><div class="FQA">Quote:</div><asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="False" CssClass="Grid"
    DataKeyNames="status" 
      onselectedindexchanged="gvCustomers_SelectedIndexChanged" 
      BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" 
      CellPadding="3" CellSpacing="2">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:ImageButton ID="imgShow" runat="server" OnClick="Show_Hide_ChildGrid" ImageUrl="~/Images/plus.png"
                    CommandArgument="Show" />
                <asp:Panel ID="pnlOrders" runat="server" Visible="false" Style="position: relative">
                    <asp:GridView ID="gvOrders" runat="server" AutoGenerateColumns="false" PageSize="5"
                        AllowPaging="true" OnPageIndexChanging="OnChildGrid_PageIndexChanging" CssClass="ChildGrid">
                        <Columns>
                            <asp:BoundField ItemStyle-Width="150px" DataField="analysisId" HeaderText="Analysis Id" />
                            <asp:BoundField ItemStyle-Width="150px" DataField="alertId" HeaderText="Alert Id" />
                            <asp:BoundField ItemStyle-Width="150px" DataField="alertType" HeaderText="Alert Type" />
                            <asp:BoundField ItemStyle-Width="150px" DataField="cveId" HeaderText="CVD-ID" />
                            <asp:BoundField ItemStyle-Width="150px" DataField="status" HeaderText="Status" />
                            <asp:BoundField ItemStyle-Width="150px" DataField="subStatus" HeaderText="Sub Status" />
                        </Columns>
                    </asp:GridView>
                </asp:Panel>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField ItemStyle-Width="150px" DataField="alertType" 
            HeaderText="Alert Type" >
<ItemStyle Width="150px"></ItemStyle>
        </asp:BoundField>
        <asp:BoundField ItemStyle-Width="150px" DataField="status" HeaderText="Status" >
<ItemStyle Width="150px"></ItemStyle>
        </asp:BoundField>
        <asp:BoundField DataField="count" HeaderText="Count" />
    </Columns>
    <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
    <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
    <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
    <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
    <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
    <SortedAscendingCellStyle BackColor="#FFF1D4" />
    <SortedAscendingHeaderStyle BackColor="#B95C30" />
    <SortedDescendingCellStyle BackColor="#F1E5CE" />
    <SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView></blockquote>