private void vratiNaKorak1()
 {
     Keyboard.ClearFocus();
     BackStepMenuItem.IsEnabled = false;
     NextStepMenuItem.IsEnabled = true;
     Korak1Ucionica.Focus();
 }
 public void backClick(object sender, RoutedEventArgs e)
 {
     BackStepMenuItem.IsEnabled = false;
     NextStepMenuItem.IsEnabled = true;
     Korak1Ucionica.Focus();
 }