Looking at the data manager we find
`node->SetSelected(..)` in `void QmitkDataManagerView::NodeSelectionChanged(const QItemSelection& /*selected*/, const QItemSelection& /*deselected*/)`.
This sets the //selected// property of the data node so that other plugins can easily find out if a node has been selected. This is currently used in T25483.
Since we use the new selection concept - also with a focus on a more local selection - we do not maintain the //selected// property anymore (apart from the data manager).
We should investigate if this property is still needed / used by other plugins and if so how we want to maintain the //selected// property using the new selection concept.
**In MITK**
https://phabricator.mitk.org/source/mitk/browse/develop/Modules/Core/src/DataManagement/mitkDataNode.cpp$514
https://phabricator.mitk.org/source/mitk/browse/develop/Modules/RT/src/mitkDoseImageVtkMapper2D.cpp$456
https://phabricator.mitk.org/source/mitk/browse/develop/Modules/Core/src/Rendering/mitkImageVtkMapper2D.cpp$467
https://phabricator.mitk.org/source/mitk/browse/develop/Modules/PlanarFigure/src/Interactions/mitkPlanarFigureInteractor.cpp$343 and more
https://phabricator.mitk.org/source/mitk/browse/develop/Modules/PlanarFigure/src/Rendering/mitkPlanarFigureMapper2D.cpp$476
https://phabricator.mitk.org/source/mitk/browse/develop/Modules/PlanarFigure/src/Rendering/mitkPlanarFigureVtkMapper3D.cpp$59
https://phabricator.mitk.org/source/mitk/browse/develop/Plugins/org.mitk.gui.qt.application/src/QmitkFileOpenAction.cpp$61
For usage inside the LevelWindowManager see branch in this task.