You can dump the interface declaration of applications that implement SB-support using the sdef|sdp commands like so;
$ > sdef /System/Library/CoreServices/Finder.app | sdp -fh --basename finder
This dumps the scripting interface of Finder.app in the current directory, in the file <basename>.h which in this case would be finder.h.
In this interface you'll find that several objects implement
- (void) updateNecessity:(BOOL)necessity registeringApplications:(BOOL)registeringApplications;
..which is used for updating the current view of the relevant object.