private async Task <object> CommandImportExecute(object obj)
{
DeckImporter deckImporter = obj as DeckImporter;
await deckImporter.ImportFromFile();
deck.SelectedVersion.Cards = new PropertiesObservableCollection <CardInstance>(deckImporter.Cards);
//curr version shour equal deck.selected version, attch change to reflect clink for remove in deck history
CurrentVersion.Cards.CollectionChanged += (s, e) => { RaisePropertyChangedEvent(nameof(ChangesFromCurrentVersion)); };
RaisePropertyChangedEvent(String.Empty);
return(null);
}