private void click_newUser(object sender, RoutedEventArgs e)
{
newUser newUser = new newUser(model);
newUser.Show();
}
/// <summary>
/// the function handles the new user button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void click_newUser(object sender, RoutedEventArgs e)
{
newUser newUser = new newUser(controller);
newUser.Show();
}