import javafx.application.Application;
import javafx.beans.value.*;
import javafx.event.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;

public class RT33416 extends Application {
    
    private int rowIndex = 0;

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

    @Override public void start(Stage primaryStage) {
        final GridPane gridPane = new GridPane();
        ScrollPane scrollPane = new ScrollPane(gridPane);
        TitledPane titledPane1 = new TitledPane("TitledPane 1", scrollPane);
        
        // **** Comment out this line to see bug ****
        gridPane.add(new TextField(), 1, rowIndex++);

        Button button = new Button("Add row");
        button.setOnAction(new EventHandler<ActionEvent>() {
            @Override public void handle(ActionEvent t) {
                gridPane.add(new TextField(), 1, rowIndex++);
            }
        });

        TitledPane titledPane2 = new TitledPane("TitledPane 2", null);
        
        Accordion accordion = new Accordion();
        accordion.getPanes().addAll(titledPane1, titledPane2);
        accordion.setExpandedPane(titledPane1);
        
        VBox vbox = new VBox(20);
        VBox.setVgrow(accordion, Priority.ALWAYS);
        vbox.getChildren().addAll(accordion, button);

        primaryStage.setScene(new Scene(vbox, 300, 400));
        primaryStage.setTitle("RT33416");
        primaryStage.show();
    }

}