FULL PRODUCT VERSION :
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 8.1 Pro 64-bit (6.3, Build 9600)

A DESCRIPTION OF THE PROBLEM :
When setting the index of the selected item in the ComboBox, the onAction event is not called.

REGRESSION. Last worked in version 8u25

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1 - Create a new JavaFX fxml project
2 - Add ComboBox, add an Id and an onAction
3 - In the fxml controller, add three items to the comboBox.
4 - Select last index
5 - Have a System.out to print something to the console in the onAction method.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The System.out should print out when the even it fired.
ACTUAL -
Nothing is written out due to the event is not being fired.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Controller:

public class FXMLDocumentController implements Initializable {
    @FXML
    private ComboBox<String> comboBox;

    /**
     * Initializes the controller class.
     */
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        
        ArrayList<String> modesDefault = new ArrayList<>();
        modesDefault.add("Backup");
        modesDefault.add("Burn");
        modesDefault.add("Erase");
        comboBox.getItems().addAll(FXCollections.observableList(modesDefault));
        comboBox.getSelectionModel().selectFirst();
        comboBox.getSelectionModel().selectLast();
    }

    @FXML
    private void onAction_ComboBox(ActionEvent event) {
        System.out.println("onAction is fired!");
    }
}



FXML:

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="test.comboboxcalled.FXMLDocumentController">
   <children>
      <ComboBox fx:id="comboBox" layoutX="75.0" layoutY="75.0" onAction="#onAction_ComboBox" prefWidth="150.0" />
   </children>
</AnchorPane>
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Call the onAction manually each time an index is set.

SUPPORT :
YES