JavaFX ComboBox create from ObservableList

// Demonstrate a combo box. 

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class Main extends Application {

   private ComboBox<String> myComboBox;
   private Label response = new Label();;

   public static void main(String[] args) {
      launch(args);//  w w w.  j a  v a2  s .  c o  m
   }
   public void start(Stage myStage) {
      myStage.setTitle("ComboBox Demo");

      // Use a FlowPane for the root node. In this case,
      // vertical and horizontal gaps of 10.
      FlowPane rootNode = new FlowPane(10, 10);

      rootNode.setAlignment(Pos.CENTER);

      Scene myScene = new Scene(rootNode, 280, 120);

      myStage.setScene(myScene);
      // Create an ObservableList of entries for the combo box.
      ObservableList<String> data = 
            FXCollections.observableArrayList("CSS", "HTML", "Java");

      myComboBox = new ComboBox<String>(data);

      // Set the default value.
      myComboBox.setValue("Java");

      // Set the response label to indicate the default selection.
      response.setText("Selected is " + myComboBox.getValue());

      // Listen for action events on the combo box.
      myComboBox.setOnAction(new EventHandler<ActionEvent>() {
         public void handle(ActionEvent ae) {
            response.setText("Selected is " + myComboBox.getValue());
         }
      });

      // Add the label and combo box to the scene graph.
      rootNode.getChildren().addAll(myComboBox, response);

      myStage.show();
   }
}