[vtkusers] SphereWidget InteractionEvent not triggered?

[David Doria]

In this example:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/SphereWidgetEvents

I am trying to handle StartInteractionEvent: and InteractionEvent as
recommended by the documentation:
http://www.vtk.org/doc/nightly/html/classvtkSphereWidget.html#details

However, these events do not seem to be triggered ("InteractionEvent!" is
not displayed when I move the mouse). LeftButtonPressEvent works as
expected (the output "LeftButtonPressEvent!" is displayed when I click the
left button).

Does anyone know why these events events are not behaving as I'd expect?

Thanks,

David
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