private void ListBoxPersonal_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
selectedPersonal = (Personal)listBoxPersonal.SelectedItem;
lblAvdelning.Content = selectedPersonal.avdelning;
listViewBarn.ItemsSource = null;
listViewBarn.ItemsSource = db.GetBarnByAvdelning(selectedPersonal.avdelning);
}