Hover menu dosent works on gridview row

I have grid view with hover menu in code behind I set targetcontrolid on each row but hover dosen't works It works on whole gridview not for each row I use ajaxtoolkit version 4.5.7.1213

my code is

<ItemTemplate><asp:Label ID="Label2" runat="server" Text='<%# Bind("naziv") %>'></asp:Label><asp:Panel ID="Panel1" runat="server" CssClass="HoverMenu"><asp:LinkButton ID="LinkButton1" runat="server">edit</asp:LinkButton><asp:LinkButton ID="LinkButton2" runat="server">delete</asp:LinkButton></asp:Panel><cc1:HoverMenuExtender ID="HoverMenuExtender1" runat="server" HoverCssClass="Hover"
                             PopupControlID="Panel1"
                             PopupPosition="Right"
                             TargetControlID="Panel1"
                             PopDelay="50"></cc1:HoverMenuExtender></ItemTemplate>

Code behind is

protected void gr_RowCreated(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                HoverMenuExtender hov = e.Row.FindControl("HoverMenuExtender1") as HoverMenuExtender;
                e.Row.ID = e.Row.RowIndex.ToString();
                hov.TargetControlID = e.Row.ID;


            }
        }
Please help