Delete a virtual device in a VI

Hello,
By programming a VI, I can't delete a virtual device which exist in MAX configuration.
By programming in a VI :
I open a session to NISE on my system
Then I get a reference from the virtual device that I want to delete
Then with this reference I delete the virtual device
Then I close the session to NISE.
But when I open MAX the virtual device is still here (with this message there is a JPEG file of the diagram).
Perhaps someone can explain to me how to do ?
Sincerely
For information I use : LabVIEW 8.2 and NISE 3.0
Attachments:
diagramme.jpg ‏40 KB

See here

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