function draw ()

function loadWindow(sender)
{
  var treeView = new ui.TreeView();
  treeView.width = treeView.height = ui.Unit.percentage(100);
  treeView.theme = "standard";

  // create a tree node that will be a root in our hierarchy
  var root = new ui.TreeNode("body");
  treeView.items.add(root);

  sender.element.querySelector("#nav_tree").appendChild(tree.draw());
  tree.attach();
}