AcRxObject AcDbSelectGrip
class AcDbSelectGrip : public AcRxObject;
dbSelectGrip.h
This class allows applications to determine whether a grip on a custom entity is selectable.
Currently, it is only called from the AutoCAD grip mechanism before snapping to, hovering, or heating a grip. Only called if the AcDbSelectGrips protocol extension is not implemented or is implemented and does not reject selection.