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Generic Sampler Support for JavaFX Control libraries
There is a newer version: 1.0.3
package hello;

import java.util.Optional;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.control.TextInputDialog;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class DialogTest extends Application {

    @Override public void start(final Stage stage) {
        stage.setTitle("Alert Test");

        Group root = new Group();
        Scene scene = new Scene(root, 600, 450);
        scene.setFill(Color.ANTIQUEWHITE);

        final Rectangle rect = new Rectangle();
        rect.setX(100);
        rect.setY(40);
        rect.setWidth(100);
        rect.setHeight(50);
        rect.setFill(Color.RED);
        root.getChildren().add(rect);

        final Timeline timeline = new Timeline();
        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.setAutoReverse(true);
        final KeyValue kv = new KeyValue(rect.xProperty(), 200);
        final KeyFrame kf = new KeyFrame(Duration.millis(4000), kv);
        timeline.getKeyFrames().add(kf);
        timeline.play();

        final Button button1 = new Button();
        button1.setText("Toggle color");
        button1.setLayoutX(25);
        button1.setLayoutY(40);
        button1.setOnAction(e -> {
            Alert alert = new Alert(AlertType.CONFIRMATION,
                    "Really toggle the color?");
            alert.setTitle("Verify Change");
            alert.initOwner(stage);
            ButtonType result = alert.showAndWait().orElse(ButtonType.CANCEL);
            if (result == ButtonType.OK) {
                Color newColor = Color.RED.equals(rect.getFill())
                        ? Color.GREEN : Color.RED;
                rect.setFill(newColor);
            } else {
                System.err.println("Color change canceled");
            }
        });

        root.getChildren().add(button1);

        final Button button2 = new Button();
        button2.setText("Question");
        button2.setLayoutX(25);
        button2.setLayoutY(80);
        button2.setOnAction(e -> {
            Alert alert = new Alert(AlertType.CONFIRMATION,
                    "How about those Giants?",
                    ButtonType.YES, ButtonType.NO);
            alert.setTitle("SF Giants");
            alert.initOwner(stage);
            ButtonType result = alert.showAndWait().get();
            if (result == ButtonType.YES) {
                System.err.println("Good answer");
            } else {
                System.err.println("What do you mean 'NO' ???");
            }
        });

        root.getChildren().add(button2);

        final Button button3 = new Button();
        button3.setText("Dialog");
        button3.setLayoutX(25);
        button3.setLayoutY(120);
        button3.setOnAction(e -> {
            Alert alert = new Alert(AlertType.INFORMATION,
                    "Hi, I'll be your modal dialog today");
            alert.initOwner(stage);
            alert.showAndWait();
            System.err.println("Continue");
        });

        root.getChildren().add(button3);

        final Button button4 = new Button();
        button4.setText("Name");
        button4.setLayoutX(25);
        button4.setLayoutY(160);
        button4.setOnAction(e -> {
            TextInputDialog dlg = new TextInputDialog("Mud");
            dlg.setTitle("What is your name?");
            dlg.initOwner(stage);
            Optional result = dlg.showAndWait();
            if (result.isPresent()) {
                System.err.println("Your name is: " + result.get());
            } else {
                System.err.println("Canceled");
            }
        });

        root.getChildren().add(button4);

        final Button button5 = new Button();
        button5.setText("Abort/Retry/Fail");
        button5.setLayoutX(25);
        button5.setLayoutY(200);
        button5.setOnAction(e -> {
            ButtonType abort = new ButtonType("Abort");
            ButtonType retry = new ButtonType("Retry");
            ButtonType fail = new ButtonType("Fail");
            Alert alert = new Alert(AlertType.ERROR, "So sorry for you!",
                    abort, retry, fail);
            alert.setTitle("You lose");
            alert.initOwner(stage);
            ButtonType result = alert.showAndWait().orElse(fail);

            if (result == abort) {
                System.err.println("ABORT! This is very, very bad!");
            } else if (result == retry) {
                System.err.println("RETRY? You're joking, right?");
            } else if (result == fail) {
                System.err.println("FAIL! So what else is new?");
            }
        });

        root.getChildren().add(button5);

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Application.launch(args);
    }
}