JavaFX: Showing a dialog in browser on fullscreen mode - javafx-2

Question

I'm experiencing some weird behavior while trying to show a dialog on my application when my Stage is on fullscreen mode.
Everything works OK while I'm launching my application as a standalone app. When I run from the browser, the modal dialog takes the Stage out of fullscreen. Although, it doesn't go really "out" of fullscreen mode... The code still thinks it's fullscreen (fullscreenProperty == true), but it doesn't show as fullscreen. And after closing the dialog, if you press ESC (which would take you out of fullscreen mode), the application crashes.
Here's a sample code:
public class Test1 extends Application {
#Override
public void start(final Stage primaryStage) {
Button btn = new Button();
btn.setText("Say 'Hello World'");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
Stage dialogStage = new Stage(StageStyle.UTILITY);
dialogStage.initModality(Modality.APPLICATION_MODAL);
dialogStage.setScene(new Scene(VBoxBuilder.create().
children(new Text("Hi"), new Button("Ok.")).
alignment(Pos.CENTER).padding(new Insets(5)).build()));
dialogStage.initOwner(primaryStage);
dialogStage.show();
System.out.println(primaryStage.isFullScreen());
}
});
StackPane root = new StackPane();
root.getChildren().add(btn);
Rectangle2D r = Screen.getPrimary().getBounds();
Scene scene = new Scene(root, r.getWidth(), r.getHeight());
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.setFullScreen(true);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
Any idea how to solve this? Or any idea of what I can use instead of a Stage dialog?
Thanks in advance.