Header file: MapReactors.h.
The AcMapQueryLibraryReactor class is used to represent a query library reactor, which notifies an application of query library events.
To create a specific query library reactor, subclass from AcMapQueryLibraryReactor.
Use AcMapQueryLibrary::AddReactor to add a reactor to a query library and AcMapQueryLibrary::RemoveReactor to remove it.