[Zope] How about create another method other than index_html to get content in OFS::File?

Dear all, My problem is that : I have a ZClass based on OFS::File. I need to override the default index_html for my own purpose. After I created my own index_html, I found myself can't access the content of that object. Since: 1. I have no way to access the original method index_html of the base class 2. In OFS::File, There is no other method than index_html to access the content of this object. That's why I modify Image.py and add one line: getContent=index_html It's work for me. I don't think it's a good idea, since it's quick and dirty. Is there any better way to do this? Thanks Iap, Singuan