View source for Documentation/Nightly/Developers/FAQ/IO

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== Why is my node writer not showing up in the Save dialog ? ==
You have implemented a loadable module with a new MRML node, its storage node, and the [http://slicer.org/doc/html/classqSlicerNodeWriter.html qSlicerNodeWriter] needed to save your node on your system. If the writer is not showing up for your node in the [http://slicer.org/doc/html/classqSlicerSaveDataDialog.html qSlicerSaveDataDialog], it could be one of those following reasons :

* You need to register your writer in the [http://slicer.org/doc/html/classqSlicerIOManager.html qSlicerIOManager] in ''qSlicerYourModule::setup()''.
Example: [https://github.com/Slicer/Slicer/blob/3dd75da/Modules/Loadable/Markups/qSlicerMarkupsModule.cxx#L136-L138 qSlicerMarkupsModule writer registration]
* Your node needs to be a sub-class of [http://slicer.org/doc/html/classvtkMRMLStorableNode.html vtkMRMLStorableNode].