public MainWindow()
{
InitializeComponent();
lista = new List <Osoba>();
see = new SeeUsr();
Ukryjprzyciski();
}
private void PodgladButton_Click(object sender, RoutedEventArgs e)
{
see = new SeeUsr();
Osoba podglad = lista[ListBox.SelectedIndex];
see.osoba = podglad;
see.Show();
}