Extending The Gridview To Show A Navigation Bar At Underneath The Gridview?

I have developed an asp.net control that inherits from the gridview and its called gridviewex... i need some page navigation stuff to render underneath it for some custom paging that i am implenting.. All going well but i can't seem to add new controls to the controls.. For example what i wanted to do is add a asp.net Panel underneath the grid and than add linkbuttons to the panel. I have this so far but it gives an error
Unable to cast object of type 'System.Web.UI.WebControls.Panel' to type 'System.Web.UI.WebControls.Table'.

protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
Panel uxGridViewNavigation = new Panel();
LinkButton linkButton = null;
linkButton = new LinkButton();
linkButton.Text = "First";
linkButton.Click += new EventHandler(linkButton_Click);
uxGridViewNavigation.Controls.Add(linkButton);
this.Controls.Add(uxGridViewNavigation);
}