[Zope] Making my own Folder Object

Hello: I want to create an Folder object that has certian attributes in it. Creating a ZClass dosen't seem to be the way to do this, but how can I get _my_ special folder to appear in the "Available Objects" list in a regular folder? What I'm trying to do is simply be able to add some folders into a folder-- these folders would all have the same attibutes in them, the elements of each would be different of course- then there would be some dtml documents in each that would use some of these variables in their output. I really just want to modify the folder object to make my own which has more attibutes in it. Is there an obvious way to do this that I'm missing? -andy diller