The following User Interface Library events are sent to LED control callback functions.
| EVENT_LEFT_CLICK | EVENT_GOT_FOCUS |
| EVENT_LEFT_DOUBLE_CLICK | EVENT_LOST_FOCUS |
| EVENT_RIGHT_CLICK | EVENT_DISCARD |
| EVENT_RIGHT_DOUBLE_CLICK | EVENT_COMMIT |
| EVENT_KEYPRESS | EVENT_VAL_CHANGED |