PopupExample.java

package popup;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Popup;
import javafx.stage.Stage;

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

    @Override
    public void start(final Stage primaryStage) {
        primaryStage.setTitle("Popup Example");
        final Popup popup = createPopup();

        final HBox layout = new HBox(10);
        Button show = new Button("Show");
        show.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                popup.show(layout, 0,0);
            }
        });

        Button hide = new Button("Hide");
        hide.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                popup.hide();
            }
        });


        layout.setStyle("-fx-background-color: cornsilk; -fx-padding: 10;");
        layout.getChildren().addAll(show, hide);
        primaryStage.setScene(new Scene(layout));
        primaryStage.show();
    }

    private Popup createPopup() {
        final Popup popup = new Popup();
        popup.setAutoHide(true);
        popup.setX(300);
        popup.setY(200);
        popup.getContent().addAll(new Circle(25, 25, 50, Color.AQUAMARINE));
        return popup;
    }
}