_ControlPointRect
BRect currentBounds = _ControlPointRect();
BRect oldRect = _ControlPointRect(fCurrentPathPoint, fMode);
BRect newRect = _ControlPointRect(newIndex, newMode);
_InvalidateCanvas(_ControlPointRect());
BRect r = _ControlPointRect();
BRect _ControlPointRect() const;
BRect _ControlPointRect(int32 index,