import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.paint.Color; 
import javafx.scene.control.ColorPicker;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.MenuButton;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class MenuColorPickerBugDemo extends Application {

    @Override
    public void start(Stage stage) {
        ColorPicker colorPicker = new ColorPicker();
        CustomMenuItem customItem = new CustomMenuItem(colorPicker, false);
        MenuButton menuButton = new MenuButton("Couleur");
        menuButton.getItems().add(customItem);
        VBox root = new VBox(menuButton);
        Scene scene = new Scene(root, 320, 200);
        stage.setScene(scene);
        stage.show();
    }

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