hello, i'm trying to hook up on the event of contentservice.publishing

i have a folder which is from the document type "Events" and i have a document type "Event" so i have a tree of

Events
    Event 1
    Event 2
    Event 3

i'm trying to publish the event folder with its children from the context menu but the event of contentservice.publishing won't run, but if i publish each node separately it will run. what event should i hook up to make it work.

i'm using umbraco 6.1.3 thank you