// Neither the model nor the argument have specified a library.
// See if there is a default library in the configuration.
_topLibrary = _createDefaultLibrary(entity.workspace());
}
_libraryModel = new VisibleTreeModel(_topLibrary);
_library = new PTree(_libraryModel);
_library.setRootVisible(false);
_library.setBackground(BACKGROUND_COLOR);
// If you want to expand the top-level libraries, uncomment this.