I currently cannot map a datepicker text field. I've seen the bug logged here and am aware there is a fix coming up, but am unsure which version of Jubula this will be available in.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=429006

Do you know which version I need to be able to get access to the hot fix?

With JavaFX 9 there comes a new button called ButtonType:
http://download.java.net/jdk9/jfxdocs/javafx/scene/control/ButtonType.html

It deals with the creation of dialogs and allows a programmer to create a confirm and cancel button. This does not appear to be mappable in Jubula at the moment. Other controls on a dialog (Like textfield) work fine.

The code for creating such a dialog:

public void showSetDateAndTimeDialog(){
		DtDateAndTime currentDateAndTime;
		try {
			checkConnectionOK();
			currentDateAndTime = systemstateController.getServerDateTime();
			/*
			 * Creating controls to be used in the popup dialog
			 */
			Dialog<DtDateAndTime> dialog = new Dialog<DtDateAndTime>();
			dialog.setTitle("Set system time and date");
			dialog.setResizable(false);
			DatePicker dtpckr = new DatePicker();
			dtpckr.setMaxWidth(100);
			
			dtpckr.setValue(LocalDate.parse(currentDateAndTime.date.toString(), DateTimeFormatter.ofPattern("yyyy/MM/dd")));
			Label lblDate = new Label("Select a date:");
			Label lblTimeHour = new Label("Select an hour:");
			Label lblTimeMinute = new Label("Select a minute:");
			Label lblTimeSecond = new Label("Select a second:");
			TextField txtfldCurrentSetSecond = new TextField();
			TextField txtfldCurrentSetMinute = new TextField();
			TextField txtfldCurrentSetHour = new TextField();
			//ComboBox<String> cmbxHourPicker = getComboBox(100, ComboBoxType.Hour);
			//ComboBox<String> cmbxMinutePicker = getComboBox(100, ComboBoxType.Minute);
			Slider sldrHourPicker = getSlider(100, SliderType.Hour, txtfldCurrentSetHour, currentDateAndTime.time);
			Slider sldrMinutePicker = getSlider(100, SliderType.Minute, txtfldCurrentSetMinute, currentDateAndTime.time);
			Slider sldrSecondPicker = getSlider(100, SliderType.Second, txtfldCurrentSetSecond, currentDateAndTime.time);
			/*
			 * Adding a grid pane to keep controls in correct place and aligned correctly
			 */
			GridPane grdpn = new GridPane();
			grdpn.add(lblDate, 1, 1);
			grdpn.add(dtpckr, 2, 1);
			grdpn.add(lblTimeHour, 1, 2);
			grdpn.add(sldrHourPicker, 2, 2);
			grdpn.add(txtfldCurrentSetHour, 3, 2);
			grdpn.add(lblTimeMinute, 1, 3);
			grdpn.add(sldrMinutePicker, 2, 3);
			grdpn.add(txtfldCurrentSetMinute, 3, 3);
			grdpn.add(lblTimeSecond, 1, 4);
			grdpn.add(sldrSecondPicker, 2, 4);
			grdpn.add(txtfldCurrentSetSecond, 3, 4);
			dialog.getDialogPane().setContent(grdpn);
			/*
			 * Creating buttons for user to press
			 */
			ButtonType bttntypOK = new ButtonType("OK", ButtonData.OK_DONE);
			ButtonType bttntypeCancel = new ButtonType("Cancel", ButtonData.CANCEL_CLOSE);		
			dialog.getDialogPane().getButtonTypes().add(bttntypeCancel);
			dialog.getDialogPane().getButtonTypes().add(bttntypOK);
			/*
			 * End of creating controls to be used in the popup dialog
			 */
			/*
			 * Creating a method to convert the result from the popup box to the object DtDateAndTime
			 * This will be called upon the user pressing the cancel, ok or closing the popup window
			 */
			dialog.setResultConverter(new Callback<ButtonType, DtDateAndTime>(){
				@Override
				public DtDateAndTime call(ButtonType param) {
					/*
					 * Make sure the user entered all information and pressed the OK button
					 */
					if(param == bttntypOK && checkIfAllDialogHasBeenFilledIn(grdpn)){
						int hour = (int)Math.floor(sldrHourPicker.getValue());
						int minute = (int)Math.floor(sldrMinutePicker.getValue());
						int second = (int)Math.floor(sldrSecondPicker.getValue());
						return ICrashUtils.setDateAndTime(dtpckr.getValue().getYear(),
								dtpckr.getValue().getMonthValue(), dtpckr.getValue().getDayOfMonth(), hour,
								minute, second);
					}
					return null;
				}
			});
			Optional<DtDateAndTime> result = dialog.showAndWait();
			/*
			 * If result is present, we have data to work with, otherwise the user cancelled the action in some way
			 */
			if(result.isPresent()){
				try {
					checkConnectionOK();
					if (!systemstateController.oeSetClock(result.get()).getValue())
						showWarningMessage("Unable to set clock", "Unable to set the system clock, please try again");
					refreshData();
				} catch (ServerOfflineException | ServerNotBoundException e) {
					showExceptionErrorMessage(e);
					serverHasGoneDown();
				}
			}
			else
				showUserCancelledActionPopup();
		} catch (ServerOfflineException | ServerNotBoundException e1) {
			showExceptionErrorMessage(e1);
			serverHasGoneDown();
		}
	}