* @return javax.swing.JTree
* @uml.property name="treeLayers"
*/
private JTree getTreeLayers() {
if (treeLayers == null) {
treeLayers = new JTrafficLayerTree();
treeLayers.setShowsRootHandles(false);
treeLayers.setToggleClickCount(-1);
treeLayers.setModel(new DefaultTreeModel(new DefaultMutableTreeNode("No project loaded")));
treeLayers.setEditable(true);
treeLayers.setCellRenderer(new ProjectTreeCellRenderer());