>Hi,
> I have a property of myclass that store the reference of an object. How to RELEASE the property? I try myclass.oObjRef = .NULL.
>does it RELEASE the object?
>

If no other object references to that oibject instance exist, yes, that will release the object. If other references to the object exist, the object will continue to exist until either all the object references to it are gone, or you explicitly trigger the release. A simple example:

oObject1 = CREATEOBJ('MyClass')
oObject2 = oObject1  && two references to the same object
oObject1 = NULL && object still exists because oObject2 still references it
oObject2 = NULL  && object releases since no references exist

oObject3 = CREATEOBJ('MyClass')
oObject4 = oObject3  && again, two references
? ISNULL(oObject4)
oObject3.Release() && the object destroys itself even though other object refs exist
? ISNULL(oObject4)  && now null since the object is gone

oObject5 = CREATEOBJ('MyClass')
oObject5.AddProperty('oObjRef')
oObject5.oObjRef = CREATEOBJ('SomeClass')
oObject5.oObjRef = NULL  && object goes away
* oObject5.oObjRef.Release() would kill it, too.
* as would oObject5 = NULL

NOTE: NOT ALL CLASSES HAVE A RELEASE METHOD!!!! Classes based on the CUSTOM class, for example, do not have a native Release