_SplitterItemAt
_LayoutItem(_SplitterItemAt(index), splitterInfo);
SplitterItem* splitterItem = _SplitterItemAt(i - 1);
if (SplitterItem* item = _SplitterItemAt(index))
return _SplitterItemAt(point) != NULL;
if (_SplitterItemAt(point, &index) != NULL) {
SplitterItem* splitItem = _SplitterItemAt(i);
ItemLayoutInfo* splitterInfo = _ItemLayoutInfo(_SplitterItemAt(index));
SplitterItem* _SplitterItemAt(const BPoint& point,
SplitterItem* _SplitterItemAt(int32 index) const;