Erlang Run Time Errors

[micheus]

The command in our plugins usually returns the St - if is is changed or not, keep, next or another 'event' - a tuple that can be processed by the main event handler that will result in another command be call.

I may be a little wrong about the correct options. I'm away from my PC.

I see you are managing a command that calls new_viewer_stereo which calls new_viewer that seems to end up by returning a tuple {wings,geom_title,[{geom,2}]} which I think it's a Geometry window 'id'.
Surely it's not a expect value to be returned to the main event handler.