import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;

public class App extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Button goButton = new Button("Mehet");
        goButton.setOnAction(e -> {
            boolean result = DlgBox.show("cím", "Biztos?");
            System.out.println("válasz: " + result);
        });
        StackPane root = new StackPane();
        root.getChildren().add(goButton);
        Scene scene1 = new Scene(root, 300, 250);
        primaryStage.setScene(scene1);
        primaryStage.show();
    }

}