Java Tooltip .setContentDisplay (ContentDisplay value)

public final void setContentDisplay(ContentDisplay value)

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.Tooltip;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;
//  w ww  .j a  va 2  s. com

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

    @Override
    public void start(Stage stage) {
        Scene scene = new Scene(new Group());
        stage.setWidth(300);
        stage.setHeight(150);

        Button button = new Button("Hover Over Me");
        Tooltip toolTip = new Tooltip();
        toolTip.setContentDisplay(ContentDisplay.BOTTOM);
        
        button.setTooltip(toolTip); 
        ((Group) scene.getRoot()).getChildren().add(button);

        stage.setScene(scene);
        stage.show();
    }
}