call to ajax popupextender not work

<asp:TemplateField>
<itemtemplate>
   <asp:LinkButton ID="lnkOptions" CausesValidation="false" runat="server" OnClick="options_Click" Text="Option">
</itemtemplate>

protected void options_Click(object sender, EventArgs e)
{
    try
    {
        gvrow = (GridViewRow)((LinkButton)sender).Parent.Parent;

        Load_Options_Panel();
        flagQueryReDesign = 1;
        BindGrid();
        //Display Options Panel popup
        Option_ModalPopupExtender.Show();
    }
    catch (Exception ex)
    {
        //////ExceptionClass.LogException(ex, "Configure.cs");
        //Could not select the clicked row
        //Could not Load the Modal Popup After user clicks the option button
    }
}

<asp:Label ID="btnShowPopup" runat="server" Style="display: none">
<AjaxControlToolkit:ModalPopupExtender BackgroundCssClass="modalBackground" ID="Option_ModalPopupExtender"
       runat="server" TargetControlID="lnkOptions" PopupControlID="OptionPanel" CancelControlID="OptionPanel_Button_Cancel">