Another collectgarbage question. (Inherited class)

Hello,

I am using luabind 0.8.1, lua5.1.4, MSVC2005.
I have an example where garbage collection doesn't work for a derived lua
class.
Is this a normal behavior? What should I modify?

class 'VVV'

function VVV:__init()
   print("ctor VVV")
end

function VVV:__finalize()
   print("dtor VVV")
end


class 'GCtest'

function GCtest:__init()
   self.skel=VVV()
end

class 'GCtest2'(GCtest) -- derived class
function GCtest2:__init()
   GCtest.__init(self)
end

function gctest()
   do
      local test=GCtest()
   end
   collectgarbage() -- dtor of VVV is called.
   collectgarbage()
   collectgarbage()

   do
      local test=GCtest2()
   end
   collectgarbage()
   collectgarbage()
   collectgarbage() -- dtor of VVV is not called.

end

Thank you.

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