/* Preference Screens */
        mNotificationScreen = (PreferenceScreen) prefSet.findPreference(NOTIFICATION_SCREEN);
        mTrackballScreen = (PreferenceScreen) prefSet.findPreference(NOTIFICATION_TRACKBALL);
        mExtrasScreen = (PreferenceScreen) prefSet.findPreference(EXTRAS_SCREEN);

        	boolean hasSingleLed = (getResources().getBoolean(R.bool.has_single_notification_led)
		boolean hasDualLed = (getResources().getBoolean(R.bool.has_dual_notification_led)
                || getResources().getBoolean(R.bool.has_mixable_dual_notification_led));
        if ((!getResources().getBoolean(R.bool.has_rgb_notification_led) && !hasDualLed && !hasSingleLed)
            ((PreferenceCategory) prefSet.findPreference(GENERAL_CATEGORY))
                    .removePreference(mTrackballScreen);
        }