WoltLab/WCF — pull request #1839 by joshuaruesweg (2014-11-07 15:32:00+00:00)
Title: add IParameterizedEventListener for AttachmentAction

Yeah, I know that here the API is changed. Perhaps you should merge this pull request only with dev-version 2.2. But perhaps you choose differently and you add this already with 2.1.