_treeModel = new DefaultTreeModel(createTree());
_tree = new JTree(_treeModel);
_tree.addTreeSelectionListener(this);
_tree.addTreeWillExpandListener(this);
_tree.setCellRenderer(new ObjectStoreCellRenderer());
gbc.gridx = 0;
gbc.gridy = 2;
gbc.fill = GridBagConstraints.BOTH;
gbc.weighty = 1;
gbc.weightx = 1;