import javafx.scene.paint.Color;
import javafx.application.*;
import javafx.scene.*;
import javafx.scene.shape.*;

import javafx.stage.*;

public class NoStrokeTest extends Application {

    @Override
    public void start(Stage stage) {
        stage.setWidth(500);
        stage.setHeight(500);
        stage.setScene(createScene(stage));
        stage.show();
    }

   private Scene createScene(final Stage stage){
        Group g = new Group();
        final Scene scene = new Scene(new Group());
        scene.setFill(Color.BLUE);
        Rectangle r = new Rectangle();
        r.setX(50);
        r.setY(50);
        r.setWidth(200);
        r.setHeight(100);
        r.setFill(Color.RED);
        g.getChildren().add(r);
       ((Group)scene.getRoot()).getChildren().add(r);

        return scene;
   }

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