[vtkusers] which classes can use "AddObserver" work in addition to vtkInteractorObserver and its subclasses

[Phoenix Chen]

the AddObserver is member function of vtkObject, however when I try to do:

spherePickTestActor->AddObserver(vtkCommand::RightButtonPressEvent,interactorCallBack);
spherePickTestActor->AddObserver(vtkCommand::RightButtonReleaseEvent,
interactorCallBack);

it does not work, I can only make callback of "vtkRenderWindowInteractor"
and "vtkInteractorObserver and its subclasses" successfully worked,
something like:

renWinInteractor->AddObserver(vtkCommand::RightButtonPressEvent,
interactorCallBack);

is it the nature of the design or did I do anything wrong?  Please help and
thanks a lot!


Truly,


Phoenix
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