Vtk collection 1 instance memory leak

Development
1

in 3d slicer ScriptedLoadableModuleWidget class, setup is to load the widget,when exitting from slicer,what method will be called to prevent memory leak

2

When you call a “factory” mehtod that returns a new vtkCollection object then you need to call UnRegister(None) on that object to prevent memory leaks. See more information here.

3

Thanks a lot for the help.