Radu, please "reply all" so the list gets your email too. I have the same problem - the callback just seems to be ignored: http://www.vtk.org/Wiki/Handle_mouse_events Thanks, David -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20091119/d2097e1f/attachment.htm>