public ConfigurationViewModel(IDataService dataService)
{
this.DataService = dataService;
this.Schemas = new ObservableCollection<ConfigurationSchemaViewModel>();
this.Langs = new ObservableCollection<LangViewModel>();
DbSet<PrfSchema> schemas = dataService.GetDbSet<PrfSchema>();
foreach (PrfSchema schema in schemas)
{ this.Schemas.Add(new ConfigurationSchemaViewModel(schema )); }
this.AddLangCommand = new DelegateCommand(AddLangExecute);
this.LoadLangs();
}