How add child model to a tree ?

[Zorn]

With MyGWT, to add a child to a tree, i had only to do model.add(child).
But with GXT, it seems that's don't work.
The "child" TreeItem is never showed.
What's wrong with my code ?

public class Test implements EntryPoint {

  /**
   * This is the entry point method.
   */
  public void onModuleLoad() {

    Tree tree = new Tree();
    BaseTreeLoader loader = new BaseTreeLoader(new TreeModelReader());
    TreeStore<Model> store = new TreeStore<Model>(loader);
    TreeBinder<Model> binder = new TreeBinder<Model>(tree, store);
    store.setModelComparer(new DefaultModelComparer<Model>());
    store.setMonitorChanges(true);
    binder.setDisplayProperty("name");
    Window window = new Window();
    window.setLayout(new FitLayout());
    window.add(tree);
    BaseTreeModel root = new BaseTreeModel();
    root.set("name", "ROOT");
    // add the root
    store.add(root, true);
    BaseTreeModel child = new BaseTreeModel();
    // add one child
    child.set("name", "CHILD");
    store.add(root, child, true);
    window.show();
    // only one node is show
    // "child" is not added to the Tree
  }
}

[darrellmeyer]

There was a bug in TreeBinder when adding children after the parent was renderered but before the parent had been expanded. This is fixed in SVN. As a workaround, you use this code:

public void onModuleLoad() {
    Tree tree = new Tree();

    TreeStore<Model> store = new TreeStore<Model>();
    store.setModelComparer(new DefaultModelComparer<Model>());
    store.setMonitorChanges(true);

    BaseTreeModel root = new BaseTreeModel();
    root.set("name", "ROOT");
    // add the root
    store.add(root, false);
    BaseTreeModel child = new BaseTreeModel();
    // add one child
    child.set("name", "CHILD");
    store.add(root, child, false);

    TreeBinder<Model> binder = new TreeBinder<Model>(tree, store);
    binder.setDisplayProperty("name");
    binder.init();

    Window window = new Window();
    window.setLayout(new FitLayout());
    window.add(tree);

    window.show();
  }