Completes initialization of a class object created from a ::CLASS directive. The activate method is called after all classes in a package have been created and made available, but before the main portion of the program starts to execute. Activate is called for each class in the package in their construction order. The class object is fully constructed and capable of creating new instances of the class. All other classes in the same package are also available, although other classes might not have been activated yet. Because the INIT method is called early in the class construction process, only limited class initialization is possible at that time. The activate method is the preferred method for initializing a class object.