FULL PRODUCT VERSION :
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
When using setOnShown, setOnShowing, setOnHidden, setOnHiding methods of a ChoiceBox, the listeners are not executed.

Possible reason is that the wrong event types are fired (snippet from the source):

Event.fireEvent(this, value ? new Event(ComboBoxBase.ON_SHOWN) :
            new Event(ComboBoxBase.ON_HIDDEN));

Problem is described here: http://stackoverflow.com/questions/42641744/choicebox-onshown-onhidden-methods-dont-work-javafx/42642445#42642445



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
final ComboBox<String> comboBox = new ComboBox<>();
     
   comboBox.getItems().addAll(
                "jacob.smith@example.com",
                "isabella.johnson@example.com"
        );

choiceBox.setOnShown(event -> {
            System.out.println("ChoiceBox onShown");
            System.out.println(choiceBox.getSelectionModel().getSelectedIndex());
        });

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The messages are printed to the console.
ACTUAL -
The messages are not printed to the console.

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
        choiceBox.addEventFilter(ComboBoxBase.ON_SHOWN, e -> System.out.println("ComboBoxBase.ON_SHOWN was fired"));

        choiceBox.addEventFilter(ComboBoxBase.ON_HIDDEN, e -> System.out.println("ComboBoxBase.ON_HIDDEN was fired"));

        choiceBox.addEventFilter(ComboBoxBase.ON_HIDING, e -> System.out.println("ComboBoxBase.ON_HIDING was fired"));
        choiceBox.addEventFilter(ComboBoxBase.ON_SHOWING, e -> System.out.println("ComboBoxBase.ON_SHOWING was fired"));