private async void BorrarPacTra(object sender, RoutedEventArgs e)
 {
     Esperar.Visibility = Visibility.Visible;
     try {
         var query = from UsuarioSelected in ParseObject.GetQuery("MedPac")
                     where UsuarioSelected.Get<string>("Medico") == medico.Id
                     where UsuarioSelected.Get<string>("Paciente") == usu.Id
                     select UsuarioSelected;
         ParseObject trata = await query.FirstAsync();
         await trata.DeleteAsync();
         Medico.data.Remove(usu);
         Medico.data1.Add(usu);
         var query2 = from UsuarioSelected in ParseObject.GetQuery("Notificacion")
                     where UsuarioSelected.Get<string>("Medico") == medico.Id
                     where UsuarioSelected.Get<string>("Paciente") == usu.Id
                     select UsuarioSelected;
         ParseObject trata2 = await query2.FirstAsync();
         await trata2.DeleteAsync();
         for (int i=0; i<tratas1.Count; i++)
     {
         var trata1 = new ParseObject("Tratamiento");
         trata1.ObjectId = tratas1.ElementAt(i).Id;
         await trata1.DeleteAsync();
     }
         Esperar.Visibility = Visibility.Collapsed;
         rootFrame.GoBack();
     }
     catch (Exception ex)
     {
         Esperar.Visibility = Visibility.Collapsed;
         var dialog = new Windows.UI.Popups.MessageDialog("Ha ocurrido un error, no se ha borrado este paciente");
         dialog.Commands.Add(new Windows.UI.Popups.UICommand("OK") { });
         var result = await dialog.ShowAsync();
     }
 }
 private IEnumerator deleteMessageAsync(ParseObject message)
 {
     Task task = message.DeleteAsync();
     task.ContinueWith(t =>
     {
         Debug.Log("message delete successful? " + !t.IsFaulted);
     });
     while (!task.IsCompleted) yield return null;
 }
        private async void borrarTratamientodePaci(object sender, RoutedEventArgs e)
        {
            try { 
            var trata = new ParseObject("Tratamiento");
            trata.ObjectId = tratar.Id;
            await trata.DeleteAsync();
            tratas1.Remove(tratar);
            }catch(Exception ex)
            {

            }
            
        }