Using non persistable in wizard

Hi.

I have a problem in processing wizard with non persistable objects.

In Windchill help center "Windchill Client Architecture Tree" topic said that "to show non-persistables, you can write a wrapper class extending from NmObject  and override getOid() method to return proper NmOid", but there are no any code examples.

What should i do in overriden getOid() method? Where the non persistable data is stored? How should i use NmObjectUtility?

Can anyone provide me sample code?

Thanks.