@FXML
 private void Ok_click(ActionEvent event) {
   logger.entry();
   LogEntry log = new LogEntry("6.16", "Local Delete Object Instance service");
   try {
     ObjectInstanceHandle instanceHandle =
         rtiAmb
             .getObjectInstanceHandleFactory()
             .decode(
                 ByteBuffer.allocate(4)
                     .putInt(Integer.parseInt(ObjectInstanceDesignator.getText()))
                     .array(),
                 0);
     log.getSuppliedArguments()
         .add(
             new ClassValuePair(
                 "Object instance designator",
                 ObjectInstanceHandle.class,
                 instanceHandle.toString()));
     rtiAmb.localDeleteObjectInstance(instanceHandle);
     log.setDescription("Local Object instance deleted successfully");
     log.setLogType(LogEntryType.REQUEST);
   } catch (FederateNotExecutionMember
       | NotConnected
       | NumberFormatException
       | CouldNotDecode
       | RTIinternalError
       | OwnershipAcquisitionPending
       | FederateOwnsAttributes
       | ObjectInstanceNotKnown
       | SaveInProgress
       | RestoreInProgress ex) {
     log.setException(ex);
     log.setLogType(LogEntryType.ERROR);
     logger.log(Level.ERROR, ex.getMessage(), ex);
   } catch (Exception ex) {
     log.setException(ex);
     log.setLogType(LogEntryType.FATAL);
     logger.log(Level.FATAL, ex.getMessage(), ex);
   }
   logEntries.add(log);
   ((Stage) OkButton.getScene().getWindow()).close();
   logger.exit();
 }
 @FXML
 private void Cancel_click(ActionEvent event) {
   logger.entry();
   ((Stage) OkButton.getScene().getWindow()).close();
   logger.exit();
 }
 /** Initializes the controller class. */
 @Override
 public void initialize(URL url, ResourceBundle rb) {
   logger.entry();
   OkButton.disableProperty().bind(ObjectInstanceDesignator.textProperty().isEmpty());
   logger.exit();
 }