Interactive Notifications with custom buttons on Android

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Hello,

I have been trying to make custom buttons for Interactive Notifications, but it's not working and I can't figure out why. I have done everything the doc says (http://docs.urbanairship.com/platform/android.html#interactive-notifications), and tried some tricks, but it sill not working. Here is my code :

public class NayshowApp extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        UAirship.takeOff(this, new UAirship.OnReadyCallback() {
            @Override
            public void onAirshipReady(UAirship airship) {
                // Enable user notifications
                airship.getPushManager().setUserNotificationsEnabled(!Utils.getPrefBooleanDefaultFalse(NayshowApp.this, Constants.NOTIFICATIONS, Constants.NOTIFICATIONS_DISABLED));
            }
        });

        NotificationActionButton hiButtonAction = new NotificationActionButton.Builder("hi")
                .setLabel(R.string.label_headline)
                .setIcon(R.drawable.image_error)
                .setPerformsInForeground(true)
                .build();

        NotificationActionButton byeButtonAction = new NotificationActionButton.Builder("bye")
                .setLabel(R.string.label_no_result)
                .setIcon(R.drawable.ns_icon)
                .setPerformsInForeground(true)
                .build();

        // Define the group
        NotificationActionButtonGroup buttonGroup = new NotificationActionButtonGroup.Builder()
                .addNotificationActionButton(hiButtonAction)
                .addNotificationActionButton(byeButtonAction)
                .build();

        // Add the custom group
        UAirship.shared().getPushManager().addNotificationActionButtonGroup("custom group", buttonGroup);

    }

}

Then I set up my notification with eveything except with the buttons because I custom them in my code : http://i.imgur.com/3JcOsAw.png

And it does not work, the notification has no button. And I really do not understand how I could make it work.

Thanks for your help !