JavaFx -HBox Example

package application;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ComboBox extends Application  {
Stage window;
public static void main(String[] args) {
        launch(args);
    }
@Override
public void start(Stage primaryStage) throws Exception {
// TODO Auto-generated method stub
window = primaryStage;
        window.setTitle("Combo box- JavaFX");
        HBox topmenu = new HBox();
        topmenu.setPadding(new Insets(15, 12, 15, 12));
        topmenu.setSpacing(10);
        Button b1 = new Button("Console");
        Button b2 = new Button("Action items");
        Button b3 = new Button("Members");
        Button b4 = new Button("Teams");
        Button b5 = new Button("Quit");
        topmenu.getChildren().addAll(b1,b2,b3,b4,b5);

        BorderPane borderpane1 = new BorderPane();
        borderpane1.setTop(topmenu);

        Scene scene = new Scene(borderpane1, 300, 200);
        window.setScene(scene);
        window.show();
}

}