[vtkusers] vtkXYPlotActor link error

[David Bernstein]

Hi All, When I try to use vtkXYPlotActor I get a link error upon 
instantiation:

Link Error   : undefined: 'vtkXYPlotActor::New()' (code)

I'm definitely linking all the available vtk libs (including Common) 
and I haven't run across
this problem with any other vtk objects.  Did I forget to set a switch 
when building vtk?

Thanks,
Dave Bernstein