To reproduce run following code and press button. Open dialog doesn't appear



import java.awt.AWTException;
import java.awt.Dimension;
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class ButtonText {

    public static void main(final String[] args) throws AWTException {

        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame frame = new JFrame("HelloWorldSwing");
                final JFXPanel panel = new JFXPanel();
                panel.setPreferredSize(new Dimension(550, 400));
                frame.getContentPane().add(panel);
                createScene(panel);

                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.pack();
                frame.setVisible(true);
            }

            private void createScene(final JFXPanel panel) {
                Platform.runLater(new Runnable() {

                    @Override
                    public void run() {
                        panel.setScene(new Scene(getContent(null), 400, 400));
                    }
                });
            }
        });

    }

    private static Parent getContent(final Stage stg) {


        Button openButton = new Button("Open file");
        openButton.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                new FileChooser().showOpenDialog(stg);
            }
        });

        HBox list = new HBox(10);
        list.getChildren().add(openButton);
        return list;
    }
}