@FXML
 public void OpenTrexontes(ActionEvent e) throws IOException {
   Stage stage = (Stage) backButton.getScene().getWindow();
   sl.StageLoad(
       "/sopho/Filoksenoumenoi/ProvoliTrexontonFiloksenoumenon.fxml",
       stage,
       true,
       false); // resizable true, utility false
 }
 @FXML
 public void OpenKataxorisi(ActionEvent e) throws IOException {
   Stage stage = (Stage) backButton.getScene().getWindow();
   sl.StageLoad(
       "/sopho/Filoksenoumenoi/KataxorisiFiloksenoumenou.fxml",
       stage,
       true,
       false); // resizable true, utility false
 }
 @FXML
 public void GoBack(ActionEvent e) throws IOException {
   Stage stage = (Stage) backButton.getScene().getWindow();
   sl.StageLoad("MainApp.fxml", stage, true, false); // resizable true, utility false
 }