[vtkusers] link error because of vtkObjectBase

[lzy]

I create my own class from vtkObject (vtk4.2-lastrelease), my class is DLL(msvc6.0).
But when create the DLL, link error as following:

error LNK2001: unresolved external symbol "public: virtual char const * __thiscall vtkObjectBase::GetClassNameW(void)const " (?GetClassNameW at vtkObjectBase@@UBEPBDXZ)

Maybe thre reason is the vtkObjectBase::GetClassName is virual and inline function.

How can I do? thanks.
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