[vtkusers] How to put vtkImagePlaneWidget behind actors ?

[Istvan Matis]

Hello,
 
is there ANY way to put a vtkImagePlaneWidget BEHIND other
(half-transparent) actors ?
 
For example not to be always on top of other objects?
 
See image attached for an example of a "bad" IPW on top of head actor.
 
Maybe for 3DWidgets in general?
 
Thanks,
Istvan
 
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