import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.geometry.Orientation;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.MenuButton;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.FlowPane;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;

public class Hauptfenster extends Application {
    @Override
    public void start(Stage stage) {
        FlowPane grid = new FlowPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(30);
        grid.setVgap(50);
        grid.setPadding(new Insets(20, 20, 20, 20));
        grid.setOrientation(Orientation.VERTICAL);

        MenuButton menuButton = new MenuButton("Auswahlmöglichkeiten");
        grid.getChildren().add(menuButton);

        CheckBox btn5 = new CheckBox("OK");
        grid.getChildren().add(btn5);

        MenuItem btn1 = new MenuItem("Mitarbeiter hinzufügen");
        btn1.setOnAction(new SelectionHandler(stage, btn5));
        menuButton.getItems().add(btn1);

        MenuItem btn2 = new MenuItem("Mitarbeiter entfernen");
        btn2.setOnAction(new SelectionHandler(stage, btn5));
        menuButton.getItems().add(btn2);

        MenuItem btn3 = new MenuItem("Gehalt anpassen");
        btn3.setOnAction(new SelectionHandler(stage, btn5));
        menuButton.getItems().add(btn3);

        MenuItem btn4 = new MenuItem("Personal anzeigen");
        btn4.setOnAction(new SelectionHandler(stage, btn5));
        menuButton.getItems().add(btn4);

        Scene scene = new Scene(grid, 600, 400);
        stage.setScene(scene);
        stage.show();
    }

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