model popup extender update problem

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ASP.NET4

I have a gridview and have modlepopup in templatefield with linkbutton like here:

<asp:TemplateField ShowHeader="False">
<itemtemplate>
<asp:LinkButton ID="LinkButton1" runat="server" AutoPostBack="TRUE" CausesValidation="False"
CommandName="Select" Text="Select">
<cc1:ModalPopupExtender ID="_ModelPOP_Grid"  runat="server" Enabled="false" TargetControlID="LinkButton1"
PopupControlID="Panel1" BackgroundCssClass="modalBackground" CancelControlID="_close">
</itemtemplate>

and after that when click on link button then show modlepopupextendered but every time click on link button then modlepopupextendered showing old value while i want to updated value and modlepopupextendered have a gridview which bind on grivew selectedindexcahnged like this :

protected void Grid_Account_Sataus_SelectedIndexChanged2(object sender, EventArgs e)
{
//GridViewRow row = Grid_Account_Sataus.Rows[e.NewSelectedIndex];
GridViewRow row = Grid_Account_Sataus.SelectedRow;
Label ddNew_product1 = (Label)row.FindControl("lblid");
DataTable dt = objMaster.SubGridview(Session["comp_code"].ToString(), Session["conString"].ToString(), ddNew_product1.Text);

subgridview.DataSource = dt;
subgridview.DataBind();
AjaxControlToolkit.ModalPopupExtender gfhg = (AjaxControlToolkit.ModalPopupExtender)row.FindControl("_ModelPOP_Grid");
gfhg.Enabled = true;

}