How to add library to a JavaFX project?

Hi, i'm having trouble adding a Jar to my JavaFX project in Netbeans 6.8
The library i would like to add is: http://www.cokeandcode.com/phys2d/
phys2d-060408.jar
The jar fine! (Checked with jar -tf phys2d-060408.jar)

Run the application fine (with use of the jar) but code completion does not
work. Also cannot find symbol faults, but application builds and runs fine.

A bug in Netbeans 6.8??

Regards,

Jeroen