[Pharo-project] SystemOrganizer >> classify:under: to recategorized a class ?

Hello, I'm looking for the right way to move a class from a category to another category. When I do: Smalltalk organization classify: #AClassName to: #aCategoryName, it does the job. But when I do that, no event is emited to notify that the class has been moved. So I guess I'm using this method in a wrong way, is there another way to move a class from a category to another ? Or Should this method emit an event ?