change notification

I was looking at adding a file based storage mechanism. I want it to save each change to a file whenever it happens, instead of waiting some interval and then saving all pages. Anyway, I've added my new class, but it appears that the #changed: message is getting the wrong argument. The argument name is "aStructure", but it is rarely a structure. It appears that most of the time it is an Action (e.g., PageEdit, Login, etc.). The only time that I noticed a structure was when I added something to the folder using the Contents page. I would recommend renaming Storage>>changed: and Storage>>changed. These messages are already defined on Object for dependents handling, but these methods are doing something different. Finally, I'd recommend against modifying collections outside of their containing object. For example, the FolderEdit>>moveDown: reaches inside the Folder object and manipulates the children collection. The Folder should be the only object that manipulates its children collection. Externally modifying the collection makes it hard to change the representation in the future. John Brant