Ugly flashing when opening a css-styled stage

[Robert Krüger]

Hi,

I'm in the process of evaluating Java FX 8 for our currently
Swing-based product (also Java 8) on OSX.

My first attempt to style a stage's background resulted in an ugly
flashing effect which I would classify as a show-stopper for
delivering a commercial product. This looks like it is caused by the
stage being drawn at least once before the style has been applied, and
I am wondering what the mistake is since my code is more or less a
straight-forward hello world:

package jfxtest;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class JXTest extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        final StackPane pane = new StackPane();
        final Button closeButton = new Button("Close");
        closeButton.setOnAction(event -> primaryStage.close());
        pane.getChildren().add(closeButton);
        final Scene scene = new Scene(pane, 800, 600);
        scene.getStylesheets().add("dark.css");
        scene.getStylesheets();
        primaryStage.setScene(scene);
        primaryStage.setTitle(getClass().getSimpleName());
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

with dark.css being:

.root {
          -fx-background: rgb(54, 54, 54);
}

Is this a Mac-specific problem? Is there a workaround? Which of the
two mailing lists is the more appropriate one to post these things
(JFX problems which look like they might be platform-specific) to?

Thanks,

Robert