void CreateHersteller()
{
var hersteller = ModelManager.SharedItemsService.AddHersteller();
var hv = new HerstellerView(hersteller);
hv.ShowDialog(this);
this.InitializeData(); // TreeView aktualisieren
}
void OpenHersteller()
{
if (this.myCurrentHersteller == null)
{
return;
}
var hv = new HerstellerView(this.myCurrentHersteller);
hv.ShowDialog(this);
this.InitializeData(); // TreeView aktualisieren
}