import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 *
 * @author Stanislav Smirnov <stanislav.smirnov@oracle.com>
 */
public class ComboBoxTest extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(final Stage primaryStage) {
        ComboBox createObject = new ComboBox();
        createObject.getItems().add("item1");
        createObject.getItems().add("item2");

        VBox vBox = new VBox();
        vBox.setSpacing(50);
        vBox.getChildren().addAll(createObject);

        primaryStage.setScene(new Scene(vBox, 300, 200));
        primaryStage.show();
    }
}