import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.SceneBuilder;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonBuilder;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.ScrollPaneBuilder;
import javafx.scene.layout.*;
import javafx.stage.Stage;

/**
 *
 * @author jiri
 */
public class Bug extends Application {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
    private HBox content1;
    private HBox content2;
    
    @Override
    public void start(Stage stage) {
        
        Button addButton = ButtonBuilder.create()
                .text("add")
                .onAction(new EventHandler<ActionEvent>() {

                    @Override
                    public void handle(ActionEvent arg0) {
                        Button button = new Button("button");
                        button.setPrefHeight(120);
                        content1.getChildren().add(button);
                        button = new Button("button");
                        button.setPrefHeight(120);
                        content2.getChildren().add(button);
                    }
                })
                .build();
        
        Button removeButton = ButtonBuilder.create()
                .text("remove")
                .onAction(new EventHandler<ActionEvent>() {

                    @Override
                    public void handle(ActionEvent arg0) {
                        if (content1.getChildren().size() > 0) {
                            content1.getChildren().remove(0);
                            content2.getChildren().remove(0);
                        }
                    }
                })
                .build();
        
        HBox buttons = HBoxBuilder.create()
                .children(addButton, removeButton)
                .build();
        
        content1 = new HBox();
        content1.getChildren().addAll(new Button("b u t t o n"), new Button("b u t t o n"));
        content2 = new HBox();
        content2.getChildren().addAll(new Button("b u t t o n"), new Button("b u t t o n"));
        
        ScrollPane scrollPane1 = ScrollPaneBuilder.create()
                .content(content1)
                .build();
        
        ScrollPane scrollPane2 = ScrollPaneBuilder.create()
                .content(content2)
                .build();
        
        scrollPane1.setPrefWidth(ScrollPane.USE_COMPUTED_SIZE);
        scrollPane2.setPrefWidth(300);
        
        VBox vBox = VBoxBuilder.create()
                .children(buttons, scrollPane1, scrollPane2)
                .fillWidth(false)
                .build();
        
        Scene scene = SceneBuilder.create()
                .root(vBox)
                .build();
        
        stage.setScene(scene);
        stage.show();
    }
}