private void ViewPictures_Click(object sender, RoutedEventArgs e)
{
this.Visibility = Visibility.Hidden;
int batchNr = int.Parse(cbb_BatchNumber.SelectedItem.ToString());
int dayNr = int.Parse(cbb_DayNumber.SelectedItem.ToString());
BatchRepo chosen = GetChosenBatch(batchNr, dayNr);
chosen.AddPictureDataFromDayId(batchNr, dayNr);
NewPictures newPictures = new NewPictures(this, chosen, batchNr, dayNr);
newPictures.Show();
}