protected void Page_Load(object sender, EventArgs e)
 {
     sistema.AnalizarPeticion();
     if (!IsPostBack)
     {
         StackUrlSistema.AddRuta(Request.Url.PathAndQuery);
         lknBack.Visible = (StackUrlSistema.Count() > 1);
         CrearMenuPrincipal();
         CrearMenu();
         Mostrardatos();
     }
     else
     {
         CrearMenu();// ??
     }
 }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                StackUrlSistema.AddRuta(Request.Url.PathAndQuery);
                //lknBack.Visible = (StackUrlsistema.Count() > 1);
                CrearMenuPrincipal();
                CrearMenu();
                Mostrardatos();

                ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), "removeBlockPage", "removeBlockPage();", true);
            }
            else
            {
                CrearMenu();// ??
            }
        }