To reproduce run following code with/without line Button.impl_CSS_STYLEABLES()

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package test.javaclient.shared;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.stage.Stage;

/**
 *
 * @author andrey
 */
public class Sample extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Group g;
        Scene scene;
        stage.setScene(scene = new Scene(g = new Group(),300,300));
        g.setStyle("-fx-font: 14 Arial;");
        g.getChildren().add(new Text(20,20,"HelloHelloHello"));
// Button.impl_CSS_STYLEABLES();
        stage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }

}