[rules-users] Using work items in the Eclipse ruleflow editor

I am using Eclipse to build my Drools rulefow file. I am trying to add custom work items, but I cannot seem to get anything (other than Email and Log) to show up in my Work Items palette. Does anyone know how to get the existing work items (such as FileFinder or Exec) to show up on the palette in eclipse? Eventually I will need to add custom work items to the flow, so this is make-or-break Drools functionality for my team. In pursuit of a solution to this I have combed the documentation, this mailing list archive, as well as endless Google results to no avail. Any help would be very valuable! Thanks, Mike