How to make versionable object of different class than Document?

In the programmers reference is that every PublicObject can be versioned, but there are only samples for versioning documents. I would like to keep history on folder hierarchy changes, so I think I need a Folder that can be versioned.
The question is how to do this?
Should I override isVersionable method in subclass of Folder to return true?
Please help

Hi
I am havin 10 text boxes in my application.
But out of 10 , 3 will be always together(existence of one is not possible without the other two.)
Now i want to create a vector of objects ( here object will consist of the value corresponding to these three boxes),there can be many elements in this vector.
So i m thinking to make an inner class which have three String variables corresponding to these text boxes that exists together.
What can b done ?

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