Przełożenie programu napisanego w javiefx na FXML+ kontroler

Witam mam napisany video player w javiefx i cały GUI jest napisany kodem, a potrzebuję przełożyć go na FXML + jego kontroler. Próbuje sam, ale po skompilowaniu opcja Otwórz (FileChooser) ani nawet zamknij nie działa. Tak wygląda kontroller:

public class VideoMainController implements Initializable {

   private MediaPlayer mediaPlayer;
   private Media media;

    @FXML
    private Slider volumeSlider;

    @FXML
    private Button btnStop;

    @FXML
    private Button btnPlay;

    @FXML
    private Button btnPause;

    @FXML
    private Button btnOtworz;

    @FXML
    private Slider slider1;

    @FXML
    private MediaView mediaplayer;

    @FXML
    private MenuItem btnExit;

 private void OpenFile(String name)
    {

        if(mediaPlayer != null) mediaPlayer.stop();
         try{

            media = new Media(new File(name).toURI().toURL().toExternalForm());
        }catch(MalformedURLException ex)
        {

            System.out.printf("Nie można załadować pliku");
            return;
        }

        mediaPlayer = new MediaPlayer(media);

        mediaplayer.setMediaPlayer(mediaPlayer);

        mediaPlayer.setOnReady(new Runnable(){
            @Override
            public void run() {

                slider1.setMin(0.0);
                slider1.setValue(0.0);
                slider1.setMax(mediaPlayer.getTotalDuration().toSeconds());

                mediaPlayer.currentTimeProperty().addListener(new ChangeListener<Duration>() {
                    @Override
                    public void changed(ObservableValue<? extends Duration> observableValue, Duration duration, Duration current) {
                        slider1.setValue(current.toSeconds());
                    }
                });
            }
        });
        mediaPlayer.play();
    }

    @Override
    public void initialize(URL url, ResourceBundle rb) {

        btnPlay.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                mediaPlayer.play();
            }
        });

        btnStop.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                mediaPlayer.stop();
            }
        });

        btnPause.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                mediaPlayer.pause();
            }
        });
        btnExit.setOnAction(new EventHandler<ActionEvent>() {
			public void handle(ActionEvent event) {
				Platform.exit();
			}
                        });
        btnOtworz.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {

                Node node = (Node) event.getSource();
                FileChooser fileChooser = new FileChooser();
                fileChooser.setTitle("Open file");
                File file = fileChooser.showOpenDialog(mediaplayer.getScene().getWindow());
                if (file != null) {
                    OpenFile(file.getPath());
                }
            }
        });
    }
    }

A tak wygląda plik FXML:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.media.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
   <children>
      <MenuBar layoutX="2.0" layoutY="8.0" prefHeight="25.0" prefWidth="60.0">
        <menus>
          <Menu mnemonicParsing="false" text="File">
            <items>
                  <MenuItem fx:id="btnExit" mnemonicParsing="false" text="Zamknij" />
            </items>
          </Menu>
        </menus>
      </MenuBar>
      <Button fx:id="btnPlay" layoutX="144.0" layoutY="77.0" mnemonicParsing="false" text="Play" />
      <Button fx:id="btnPause" layoutX="208.0" layoutY="77.0" mnemonicParsing="false" text="Pause" />
      <Button fx:id="btnStop" layoutX="274.0" layoutY="77.0" mnemonicParsing="false" text="Stop" />
      <Slider fx:id="slider1" layoutX="14.0" layoutY="45.0" prefHeight="14.0" prefWidth="565.0" />
      <Slider fx:id="volumeSlider" layoutX="338.0" layoutY="83.0" />
      <MediaView fx:id="mediaplayer" fitHeight="250.0" fitWidth="550.0" layoutX="25.0" layoutY="112.0" />
      <Button fx:id="btnOtworz" layoutX="62.0" layoutY="8.0" mnemonicParsing="false" text="Otwórz" />
   </children>
</AnchorPane>

Ew. czy ktoś za jakąś niewielką opłatą mógłby mi to ładnie przełożyć? To tylko jedna klasa kodu. Wyślę go zainteresowanym.