[vtkusers] vtkMatrix4x4 some changes

[Hellice]

i wanna know since vtk is open source could i add a new classe or derive a
sub classe from the exicting one or even change the code of some classes;
how to do that please

i am tryed to do that :
- i chosed classe called vtkMatrix4x4 and make copie and rename it to
vtkMatrix4x4cu
- i did some changes and add the header and the c++ file in my project
- the vtkMatrix4x4 is used in vtkCamera classe so i replace it with my
vtkMatrix4x4cu
-when i complie the project it give me Link error
I belive that vtkMatrix4x4 when the first time i build vtk  was intgrated on
vtkCommon.lib  
so please tell me how do i fix that         

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