ActiveX designers are not required to support per-property browsing, although browsing support is strongly recommended. Designers that support browsing use the ActiveX property page interfaces to create and manage property sheets. For more information, see "Managing Properties" in Chapter 3, "Supporting ActiveX and COM Interfaces."
Visual Basic provides the STrackSelection service to track the user's selections and pass them appropriately to the ActiveX designer. Designers that use the service can provide a user interface that works much like selecting controls on a form. See Chapter 6, "Services," for details on the service architecture.