>>Is it possible that it is placed into the panel (or something) with visible property set to false ?
>
>It is just inside a div within the asp content holder. See below. I tried it outside the div as well, but no difference.
>

>asp:Content ID="Content1" ContentPlaceHolderID="TrackerMasterContent" Runat="Server"
>
>     link href="../App_Themes/MainStyle.css" rel="stylesheet" type="text/css" /
>	
>     div id="parent"
>	
>     asp:HiddenField ID = "rowindex" runat="server" /
>     %--<input type="hidden" id="rowindex" runat="server" />--%
>	
>

Can you place it before the div? Since it's hidden, it would not matter.