[vtkusers] Modify user interaction in one of the viewports

[Richard Layman]

Hope someone can help with this question:

I use multiple renders in a window in their separate viewports. The question 
is how to disable, or more generally, modify the interaction in one viewport 
and not affect the others? I tried calling InteractiveOff on one render but 
the result seems to be that the user events in the viewport are sent to 
another viewport instead, eg, button1 down starts the actor in another 
viewport spinning. So I like to find out what is the best way of modifying 
the behavior of the viewports?

Thanks for your help.

Richard

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