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                            JFace -> call CommonViewer.fireSelectionChanged
CommonNavigator (ViewPart) -------- Common Viewer 
                                      ------- fireSelectionChanged -> call CommonManager.selectionChanged
                          --------- Common Manager
                                      ------- selectionChanged
>> We can simulate the selection via CommonManager.selectionChanged as follows:
  manager.selectionChanged(new SelectionChangedEvent(navigatorview.getCommonViewer(), new StructuredSelection(selectedObject)));