public override void Modify()
{
Window DetailsWindow = new KundeDetailsWindow();
DetailsWindow.DataContext = new KundeDetailsVM(DetailsWindow, this, Selected);
DetailsWindow.Show();
}
public override void Add()
{
Window DetailsWindow = new KundeDetailsWindow();
DetailsWindow.DataContext = new KundeDetailsVM(DetailsWindow, this);
DetailsWindow.Owner = mainWindow;
DetailsWindow.Show();
}