SystemOrganizer >> classify:under: to recategorized a class ?

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 ?