Fire Button onAction on key released and touch released JavaFX - javafx-8

Question

The docs say the button should fire for clicks, keypress, and touch. It doesn't seem to work.
Some code to play with.
public class FireButtonTest extends Application {
#Override
public void start(Stage primaryStage) {
TextArea ta = new TextArea();
Button btn1 = new Button();
btn1.setText("btn1");
btn1.setOnAction((ActionEvent event) -> {
ta.setText(ta.getText()+"btn1 fired \n");
});
Button btn2 = new Button();
btn2.setText("btn2");
btn2.setOnAction((ActionEvent event) -> {
ta.setText(ta.getText()+"btn2 fired \n");
});
btn2.setOnKeyReleased((KeyEvent ke) -> {
if (ke.getCode() == KeyCode.ENTER) {
ta.setText(ta.getText()+"btn2 key event -> ");
btn2.fire();
}
});
//?? can't test this
btn2.setOnTouchReleased((TouchEvent te) -> {
if (te.getTouchCount() == 1){
ta.setText(ta.getText()+"btn2 touch event -> ");
btn2.fire();
}
});
VBox root = new VBox(5);
root.getChildren().addAll(btn1, btn2, ta);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Button Test");
primaryStage.setScene(scene);
primaryStage.show();
}
}
Why can't I just press enter when the button is focused?

Answer 1

Doh! I guess you have to use the space bar. Here's the source.
<!-- language: java -->
protected static final List<KeyBinding> BUTTON_BINDINGS = new ArrayList<KeyBinding>();
static {
BUTTON_BINDINGS.add(new KeyBinding(SPACE, KEY_PRESSED, PRESS_ACTION));
BUTTON_BINDINGS.add(new KeyBinding(SPACE, KEY_RELEASED, RELEASE_ACTION));
}