Support for property set list

[thuyenle1999]

I'm currently doing a project with has a PropertySetList as a PropertyValue. When I tried to create one, the code threw an exception telling me it's not supported to do so. Creating the PropertyValue using the default constructor didn't work either because the setter of the property is private.
Can you tell me when can PropertySetList will be supported or at least which version I can revert to to make it work?
Thank you in advance.