_Add
_Add(new ValControlDigitSegment(fWholeDigits, 0, negativeVisible), RIGHT_MOST);
_Add(ValCtrlLayoutEntry::decimalPoint, RIGHT_MOST);
_Add(new ValControlDigitSegment(1, (-1)-n, false, ValControlDigitSegment::ZERO_FILL),
void _Add(ValControlSegment* segment, entry_location from,
void _Add(ValCtrlLayoutEntry& entry, entry_location from);
status = _Add(vecs, vecCount, mapEnd);
status_t _Add(file_io_vec* vecs, size_t vecCount,