The use of the QmitkMxNMultiWidget is currently not possible due to missing axial, sagittal, coronal, 3D render windows and missing multi widget planes.
a0b88fba introduced a new function that access the render windows by using the view direction.
For more changes concerning the new view directions, see T26543: Enum for AXIAL, SAGITTAL, CORONAL 3D/ORIGINAL/NONE is provided at many different locations
This new access leads to a lot of changes, which will be listed here:
Modules/ToFUI/Qmitk/QmitkToFPointSetWidget.cpp
Plugins/org.mitk.gui.qt.eventrecorder/src/internal/InteractionEventRecorder.cpp
Plugins/org.mitk.gui.qt.igt.app.echotrack/src/internal/USNavigation.cpp (see T29303: IGT classes do not work correctly with the new mxn multi widget)
Plugins/org.mitk.gui.qt.igtexamples/src/internal/QmitkIGTTrackingLabView.cpp (see T29303: IGT classes do not work correctly with the new mxn multi widget)
Plugins/org.mitk.gui.qt.imagenavigator/src/internal/QmitkImageNavigatorView.cpp (see T29364: [mxn multi widget] Image navigator cannot be used)
Plugins/org.mitk.gui.qt.measurementtoolbox/src/internal/QmitkMeasurementView.cpp (see T29333: [mxn multi widget] Measurements / planar figure not working)
Plugins/org.mitk.gui.qt.moviemaker/src/internal/QmitkScreenshotMaker.cpp (see T29302: Movie maker plugin does not work correctly with the new mxn multi widget)
Plugins/org.mitk.gui.qt.pointsetinteraction/src/internal/QmitkPointSetInteractionView.cpp (see T29365: [mxn multi widget] Pointset interaction not working)
Plugins/org.mitk.gui.qt.segmentation/src/internal/QmitkSegmentationView.cpp (see T29362: [mxn multi widget] Plane suggestion of QmitkSlicesInterpolator does not work correctly)
Plugins/org.mitk.gui.qt.tofutil/src/internal/QmitkToFUtilView.cpp
Need to check the IGT-Repository (see T29303: IGT classes do not work correctly with the new mxn multi widget).
As long as these changes are not merged to master, a workaround will be implemented: The "axial", "coronal" etc. strings will be transformed into the corresponding view direction.