* @return
*/
private Tree getTree(TreeImages resources) {
Tree tree = new Tree(resources, true);
tree.addSelectionHandler(selectionHandler);
tree.addOpenHandler(openHandler);
tree.setAnimationEnabled(true);
tree.setSize("100%", "100%");
// final TreeItem rootItem = tree.addItem(getItemString("Sites", resources.treeRoot()));
final TreeNode rootNode = new TreeNode("Sites");
final TreeItem rootItem = createItem(rootNode);