Requests a PropertySet interface, provided as m_propertySet variable.
Deriving your plug-in class from RequestPropertySet will automatically request both PropertySet and Notifications::PropertySet_ interfaces. From this point, you will be able to derive from the virtual functions as defined in Notifications::PropertySet_, and access the host-provided functions in the
This is also useful when you want to access inner property sets from the ObjectStore interface. In that case, you can ignore the m_propertySet variable and the notifications interface.