Revitez has picked up that the Balusters subcategory is missing from the Parameter Properties dialog box in the current version of Revit 2012:
If you attempt to make a View Filter, however, the Balusters subcategory IS present!
See Google Translate of original post:
http://revitez.blogspot.com/2012/01/revit-2012-filtres-et-parametres.html
Ah Revit. Consistently inconsistent.