private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            CurrentServis.Autos = new ObservableCollection <Auto>(Autos.Where(x => x.Selektovan));

            if (CurrentServis.ID == 0)
            {
                CurrentServis.dodajServis();
            }
            else
            {
                CurrentServis.azurirajServis();
            }

            ServisCreated(CurrentServis);
            this.Close();
        }