[vtkusers] Python compass widget example

[Anders Wallin]

this example:
http://www.vtk.org/Wiki/VTK/Examples/Python/vtkCompassWidget

gives me an error:
Traceback (most recent call last):
  File "compasswidget.py", line 23, in <module>
    compassRepresentation = vtkCompassRepresentation();
NameError: name 'vtkCompassRepresentation' is not defined