this.fsTree.addMouseListener(new StringFsPopupEventAdapter());
this.fsTree.setBorder(BorderFactory.createEmptyBorder(2, 4, 2, 2));
this.fsTree.setLargeModel(true);
// Only one node can be selected at any one time.
this.fsTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
this.fsTree.addTreeSelectionListener(new FSTreeSelectionListener(this));
DefaultTreeCellRenderer cellRenderer = new DefaultTreeCellRenderer();
cellRenderer.setLeafIcon(null);
// cellRenderer.setIcon(null);
cellRenderer.setClosedIcon(null);
cellRenderer.setOpenIcon(null);