# \#parameternodewrapper

**URL:** https://discourse.slicer.org/tag/parameternodewrapper/519.md

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## [Slicer 5.10 qMRMLSubjectHierarchyComboBox turned to 'None' but no issue with 5.8.1](https://discourse.slicer.org/t/slicer-5-10-qmrmlsubjecthierarchycombobox-turned-to-none-but-no-issue-with-5-8-1/45203)

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**Author:** [@chz31](https://discourse.slicer.org/u/chz31)\
**Replies:** 8\
**Last updated:** [January 28, 2026, 3:00pm UTC](https://discourse.slicer.org/t/slicer-5-10-qmrmlsubjecthierarchycombobox-turned-to-none-but-no-issue-with-5-8-1/45203 "2026-01-28T15:00:19Z")

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Dear all, In a new Extension I recently made SlicerOrbitSurgerySim (installable in Extension Manager in Slicer 5.10), when I run a function called onInitialRegistrationPushButton from the plateRegistration module, the n…

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## [How to add additional actions when using parameterNodeWrapper?](https://discourse.slicer.org/t/how-to-add-additional-actions-when-using-parameternodewrapper/42320)

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**Author:** [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Replies:** 2\
**Last updated:** [March 28, 2025, 3:57pm UTC](https://discourse.slicer.org/t/how-to-add-additional-actions-when-using-parameternodewrapper/42320 "2025-03-28T15:57:04Z")

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I like the newer parameterNodeWrapper architecture for modules, and it nicely simplifies keeping parameters and GUI elements in sync. However, I run into problems whenever I want to add any other effects from changing a…