Allow more than one images to be visible
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
(Moved from the report accidentally created on the Insight Journal bug tracker: http://public.kitware.com/Bug/view.php?id=11977)
When you click the visibility eyeball next to an image, it turn off the visibility of everything else. This means to toggle between two images (to notice differences between them, etc), you have to click one, move the mouse (which forces you to move your eyes), then click the other one.
It would be great if you could leave more than one image visible. I suppose they could be "layered" in the order in which their visibilities were turned on.