From inside what object should I inherit from to get a history option for a zclass or what method would I need to write. I have looked at lots of examples of zclasses and so far none of them have a history tab.

I am working with the STX_Document type and made a new zclass based on that which includes renderable and catalogaware as base classes. Those were the instructions on the STX document page but that still did not give me the option for a history tab but it did fix other things that I needed. Thanks Kosh