[Zope-CMF] CMFPhotoAlbum--How to make it index automatically

[Dhanu]

Hai friends,
Iam using CMFPhotoAlbum.
Iam able to make it have categories by adding action metadata.
Now i want to make it index automatically,when it is added or atleast when
it its metatdata is changed.
Can any body tell me how??

I also think CMFPhotoAlbum should inherit Portalcontent in addition to
portal folder,so that it can also have workflow.

Thanks for your help

Regards,
Dhanunjaya