Object references are references to ... objects, which are instances of classes. Hence, it makes no sense to use them without a class. Also, which GOOP tool are you referring to? There's lots of GOOP tools, including the object-oriented programming that's built into LabVIEW.
If you have LabVIEW 8.2 or greater, you can create an reference object by creating a LabVIEW object whose single data element is a queue reference. The queue is initialized to one element and contains a cluster with the object data. This is a single-element-queue "global". You can find out more about single-element-queue "globals" by searching these forums. You can find some example code here.