Hello Karl, who has same name as me:-) Yes, I can create child zclass nested in parent zclass according to the Howto on management interface. And the zclasses were inherited from Object Manager and Catalog aware class. But still I can't do it programatically. If you know how to do it, your advice would be appreciated. (Due to the schedule, I decided to just go ahead according to Rik Hoekstra's advice) I found a interesting fact. When we access some ZClass in the product folder, the typical syntax used is(in DTML) this().Control_Panel.Products['MyProductFolderName'](DTML) self.Control_Panel.Products['MyProductFolderName'] (Python) This syntax seems to say that Products is a dictionary object of Python, because we can access each product folder by key. But when I try this, <dtml-var "_.len(this().Control_Panel.Products"> this returns just "1" But interestingly, <dtml-in "this().Control_Panel.Products.objectIds()> - or - <dtml-in "this().Control_Panel.Products['MyProductFolderName'].objectIds()"> returns expected results. Should I think "Product" folder under "Control_Panel" to be a kind of dictionary object? Thanks a lot Karl Message: 17 To: "Zope-Dev \(E-mail\)" <zope-dev@zope.org> Subject: Re: [Zope-dev] Please HELP: Nested ZClass, Nested instance From: Karl Anderson <karl@digicool.com> Organization: Digital Creations Date: 22 May 2000 15:34:57 -0700 "Park, Karl" <Karl.Park@korea.bowneglobal.com> writes:

I created a ZClass in the Product folder. And anther ZClass under the ZClass(thus nested class)

To do it, I created a DTML Method which accepts user's input and then, if needed, it have to create an object.

First part is to create the parent object, which works just fine. But the sencond part to create the child object doesn't seem to work. If I take the easy way, that is, creating othere ZClass on the top of the products folder of Control Panel, I can do it. But I don't think it is a good desing from the perspective of OOP....

I had some hassles with this recently. There's a HOWTO at: http://www.zope.org/Members/gtk/containers Can you create the child zclass from the manage screen inside the parent zclass? Does the parent zclass inherit from ObjectManager before any other superclasses? -- Karl Anderson karl@digicool.com