import javafx.application.Application;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.stage.Stage;

public class RT21563_Button extends Application {

    @Override public void start(Stage primaryStage) {
        Group rootGroup = new Group();
        Scene scene = new Scene(rootGroup, 300, 600);

        Stage stage = new Stage();
        stage.setScene(scene);
        stage.show();

        rootGroup.getChildren().add(new Button("Button"));

        //stage.show();
    }

    public static void main(String[] args) {
        Application.launch(RT21563_Button.class, args);
    }
}