[vtkusers] 3dWidgets - turn off feature (not bug) for picking widgets even behind other actors

[Dean Inglis]

Mark,  

you have to assign the same picker to
all 3 widgets when you create them.

Dean


I have three image plane widgets, and I always end up grabbing the
back most one when they're all stacked on top of eachother.

Is there a way to turn that off, and just have the first one
intersected be selected?