Hello,
These forums thread might be help you in order to use helper class :
http://forums.ni.com/ni/board/message?board.id=232&message.id=825&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=231&message.id=2570&requireLogin=False
Hope this help.
Isabelle
Ingénieur d'applications
National Instruments France