public static void RegisterToPage(System.Web.UI.Page page, ClientManager manager)
 {
     page.Items[_type] = manager;
 }
 /// <summary>
 /// Obtains the current instance of the ClientManager.
 /// </summary>
 /// <param name="page">The Page object in which to look for the ClientManager.</param>
 /// <returns>The ClientManager object.</returns>
 public static ClientManager GetCurrent(System.Web.UI.Page page)
 {
     ClientManager cm = page.Items[_type] as ClientManager;
     if (cm == null)
     {
         cm = new ClientManager();
         page.Items[_type] = cm;
     }
     //+
     return cm;
 }