Treeview not expanding

[Ludovic Gerbault]

Hello

I'm trying to build a menu using the treeview control by building a List collection just like the DataBinding example of the demo

Right now, I have these three pieces of code :

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections.Generic;

namespace T2J_Application.Classes
{
    public class MenuStruct
    {
        public MenuStruct(MenuItem menu)
        {
            _menu = menu;
            _sous_menu = new List<SousMenu>();
        }

        MenuItem _menu;
        public MenuItem _Menu { get { return _menu; } }

        List<SousMenu> _sous_menu;
        public List<SousMenu> _Sous_menu { get { return _sous_menu; } }
    }

    public class SousMenu
    {
        public SousMenu(MenuItem sousMenu)
        {
            _menu = sousMenu;
            _teams = new List<SousSousMenu>();

        }

        MenuItem _menu;
        public MenuItem _Menu { get { return _menu; } }

        List<SousSousMenu> _teams;
        public List<SousSousMenu> Teams { get { return _teams; } }

    }

    public class SousSousMenu
    {
        public SousSousMenu(MenuItem soussousmenu)
        {
            _menu = soussousmenu;
        }

        MenuItem _menu;

        public MenuItem _Menu { get { return _menu; } }
    }
}

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Xml.Linq;
using T2J_Application.ApplicationService;
namespace T2J_Application.Classes
{
 public class MenuItem
 {
  public MenuItem(MenuItemBO menuItem)
  {
      Id_objet = menuItem.Id_objet;
      Code_objet = menuItem.Code_objet;
      Lib_objet = menuItem.Lib_objet;
      Action = menuItem.Action;
      Menu = menuItem.Menu;
      Position = menuItem.Position;
      Afficher = menuItem.Afficher;
      Modifier = menuItem.Modifier;
      Lib_categorie_partenaire = menuItem.Lib_categorie_partenaire;
      Id_objet_categorie = menuItem.Id_objet_categorie;
      Id_categorie_partenaire  = menuItem.Id_categorie_partenaire;
      Id_objet_pere = menuItem.Id_objet_pere;
      Id_objet_type = menuItem.Id_objet_type;
      Id_objet_avant = menuItem.Id_objet_avant;
      Est_defaut = menuItem.Est_defaut;
      Id_societe = menuItem.Id_societe;
  }

  public int Id_objet { get; set; }
  public String Code_objet { get; set; }
  public String Lib_objet { get; set; }
  public String Action { get; set; }
  public Boolean Menu { get; set; }
  public int Position { get; set; }
  public Boolean Afficher { get; set; }
  public Boolean Modifier { get; set; }
  public String Lib_categorie_partenaire { get; set; }
  public int Id_objet_categorie { get; set; }
  public int Id_categorie_partenaire { get; set; }
  public int Id_objet_pere { get; set; }
  public int Id_objet_type { get; set; }
  public int Id_objet_avant { get; set; }
  public Boolean Est_defaut { get; set; }
  public int Id_societe { get; set; }
 }
}

 IList<MenuStruct> menuStruct = new List<MenuStruct>();
            IList<MenuItemBO> result = e.Result;
            IList<MenuItemBO> ItemParent = new List<MenuItemBO>();
            IList<MenuItemBO> ItemEnfants = new List<MenuItemBO>();
            IList<MenuItemBO> ItemSousMenuParents = new List<MenuItemBO>();
            foreach (MenuItemBO item in result)
            {
                if (item.Id_objet_type == 4)
                {
                    if (item.Id_objet_pere == 0)
                    {
                        ItemParent.Add(item);
                    }
                    else
                    {
                        ItemSousMenuParents.Add(item);
                    }
                }
                else
                {
                    ItemEnfants.Add(item);
                }
            }
            foreach (MenuItemBO itemMenu in ItemParent)
            {
                MenuStruct menus;
                menuStruct.Add(menus = new MenuStruct(new MenuItem(itemMenu)));
                foreach (MenuItemBO enfants in ItemEnfants)
                {
                    SousMenu ssmenu;
                    if (menus._Menu.Id_objet == enfants.Id_objet_pere)
                    {
                        menus._Sous_menu.Add(ssmenu = new SousMenu(new MenuItem(enfants)));
                    }
                }
            }
            MenuTreeView.ItemsSource = menuStruct;
            MenuTreeView.DisplayMemberPath = "_Menu.Lib_objet";
            MenuTreeView.Margin = new Thickness(0, 30, 0, 0);
            Zone_menu.Children.Add(MenuTreeView);

When I execute this code, I can see the first level of the menu displaying fine, with the proper text.
I know by debbuging that the menuStruct variable holds the second level when I set the itemsource, but somehow, when I try to display it by clicking on the parent node, it won't expand.

FYI : MenuTreeView is declared earlier in the code, and Zone_Menu is a stackpanel in the xaml file.

Any idea why ?

[Ludovic Gerbault]

never mind, there was just a problem in the HierarchicalDataTemplate, it's fixed now