[vtkusers] Observer to vtkImagePlanewidget

[Karl Fritscher]

Hello vtkUsers,
 
perhaps a stupid questeion, but can a add an observer to
vtkImagePlaneWidget? I tired it and it worked with renderers,
renderwindows,... but not with the ImagePlaneWidget.
In fact I would just like to  (partly) synchronize the movements of two
imageplanewidgets in 2 different renderwindows with two different
vtkFLRenderWindowInteractors. Is there any way to do this??
 
Thanks for your help
 
Karl
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