editor.getGraph().getModel().addGraphModelListener(m_treeModel);
m_treeObject.setRootVisible(false);
m_treeObject.setShowsRootHandles(true);
// Handle selection of tree items
// by selecting corresponding item in graph
GraphTreeModelSelector selectionHandler = new GraphTreeModelSelector(
editor, m_treeObject, centralMediator, false);
m_treeObject.addTreeSelectionListener(selectionHandler);
editor.getGraph().getSelectionModel().addGraphSelectionListener(
selectionHandler);