[Paraview] error linking a plugin - dll

[Natalie Happenhofer]

Hi!
I´m writing a new filter called vtkDataCalculator, which should add/subtract/multiply/ divide the point data arrays of two datasets. 
Having written now a very simple version which just adds the point data, I try to build it as a Plugin and I get the error

Linking Cxx Shared Library ...\bin\libDataCalculator.dll
Creating library file: ..\bin\libDataCalculator.dll.a
CMakeFiles\DataCalculator.dir\vtkDataCalculator.obj: In function 'ZN17vtkDataCalculator3NewEv':
C:/ParaviewSource/ParaView3/Plugins/vtkDataCalculator.h:14 undefined reference to 'vtable for vtkDataCalculator'
collect2: ld returned 1 exit status 


I believe that I miss to specify a Macro, I just put 

vtkTypeMacro(vtkDataCalculator,vtkDataSetAlgorithm);

in my Headerfile. 

If there is a Macro missing, does anyone know, which one?
And if it´s something else .. what´s wrong?

thx for help,
Natalie

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