[vtkusers] Documentation for event callback return values?

[Elvis Stansvik]

Hi all,

I noticed in QVTKRenderWindowInteractor that it returns 1 in the callback
it sets up for DestroyTimerEvent:

    def DestroyTimer(self, obj, evt):
        self._Timer.stop()
        return 1

So I suspect callbacks for this event are expected to return something. But
I can't find any info in the docs on which event callbacks are expected to
return something (and what), and which are not. Is this info available
somewhere?

Thanks in advance,
Elvis
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