[vtkusers] Create many instances of vtkContourWidget

[Fcs]

Hello,

I tested your code on Ubuntu 16.04 using VTK 6.3, and everything seems to be
working correctly.  The window closes as expected using the close button or
by hitting "q".

So this seems to be a bug related to the VTK version / operating system
combo you are using.

Kind regards.





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