I have not tested yet but I think the following example can give you a hint about disabling or removing an event. https://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Interaction/Widgets/Testing/Cxx/TestContourWidget2.cxx -- Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html