setTitle(EditorExpressionsMessages.getString("ExpressionChooserDialog.Title"));
setModal(true);
final DefaultTreeSelectionModel selectionModel = new DefaultTreeSelectionModel();
selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
selectionModel.addTreeSelectionListener(new ExpressionSelectionHandler());
expressionsTree = new JTree(ExpressionsTreeModel.getTreeModel());
expressionsTree.setRootVisible(false);
expressionsTree.setSelectionModel(selectionModel);
expressionsTree.addMouseListener(new DblClickHandler());