private void cbProceso_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (sender != null)
     {
         if (cbProceso.SelectedItem != null)
         {
             if (!CargaItemsViewModel.IsRunning)
             {
                 DlgUpload           ds        = new DlgUpload();
                 CargaItemsViewModel viewModel = (this.DataContext as ObjectDataProvider).Data as CargaItemsViewModel;
                 if (viewModel != null)
                 {
                     viewModel.SetCargaItemsViewModel();
                     ds.DataContext = viewModel;
                     ds.Owner       = Application.Current.Windows[0];
                     viewModel.start();
                     ds.ShowDialog();
                 }
             }
         }
     }
 }