private void OnAddedPropertiesFile(AddedPropertiesFileEvent @event)
        {
            FileViewModel item = _factory.CreateFileViewModel(new DependencyOverride <IPropertiesFile>(@event.PropertiesFile));

            SelectedPropertyFiles.Add(item);
        }
 private bool CanRemoveFile(FileViewModel file)
 {
     return(file != null);
 }