hey,
I think you might be able to get the help you need through this discussion forum's thread...
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000D83A0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Hope this helps,
AlessioD
National Instruments