+ wxCAL_HITTEST_DAY, ///< Hit on a day in the calendar.
+ wxCAL_HITTEST_INCMONTH, ///< Hit on next month arrow (in alternate month selector mode).
+ wxCAL_HITTEST_DECMONTH, ///< Hit on previous month arrow (in alternate month selector mode).
+ wxCAL_HITTEST_SURROUNDING_WEEK, ///< Hit on surrounding week of previous/next month (if shown).
+ wxCAL_HITTEST_WEEK ///< Hit on week of the year number (if shown).