[Zope] problem with tutorial?

[Daniel M. Drucker]

If I create a folder 'test' under my root folder, in which I make a
new 'CD' object called myCD (as described in the Z Classes tutorial),
and then create run this bit of DTML in that folder:

<!--#call "myCD.manage_changeProperties({
'title'       : 'Rivers',
'artist'      : 'Daniel Drucker',
'description' : 'a piece of dog'
})"-->


Instead of myCD's title being changed, the containing folder 'test'
gets its title changed to 'Rivers'.

What am I doing wrong here?

Daniel Drucker