diff --git a/src/ui/bac-a-sable.c b/src/ui/bac-a-sable.c
index e328035..53535b1 100644
--- a/src/ui/bac-a-sable.c
+++ b/src/ui/bac-a-sable.c
@@ -29,10 +29,22 @@
 #include "../../include/base.h"
 #include "../../include/ui.h"
 
-
 static void on_button_action (GtkWidget *widget, gpointer data) { g_print ("Hello, it's me ! (again)\n");}
 static void on_destroy (GtkWidget *widget, gpointer data) { exit(0);}
 
+enum { NAME_COLUMN };
+
+   /* custom function to fill the model with data */
+static void populate_tree_model (my_store){
+    GtkTreeIter my_iter_1, my_iter_2;
+    gtk_tree_store_append (my_store, &my_iter_1, NULL);  /* Acquire an iterator */
+    gtk_tree_store_set (my_store, &my_iter_1, NAME_COLUMN, "value A", -1);
+    gtk_tree_store_append (my_store, &my_iter_2, &my_iter_1);  /* Acquire a child iterator */
+//    gtk_tree_store_set (my_store, &my_iter_2, NAME_COLUMN, "value B", -1);
+//    my_column = gtk_tree_view_column_new_with_attributes ("names", my_renderer, "text", NAME_COLUMN, NULL);
+//    gtk_tree_view_append_column (GTK_TREE_VIEW (my_tree), my_column);
+};
+
 void hello_it_s_me()
 {
     GtkWidget *my_window;
@@ -40,6 +52,14 @@ void hello_it_s_me()
     GtkWidget *my_button;
     char *my_window_title = "Hello, it's me !";
     char *my_button_title = "And I'm the button.";
+    GtkListStore *my_store;
+    GtkTreeIter my_iter_1, my_iter_2;
+    GtkWidget *my_tree;
+    GtkCellRenderer *my_renderer;
+    GtkTreeViewColumn *my_column;
+
+    GHashTable *my_hash_table;
+    guint my_hash_table_size;
 
     gtk_init(); //  <   nécessaire ici  car, pour ne pas désorganiser l'écriture de main(),
                 //      hello_it_s_me() est appelé avant l'initialisation de l'application
@@ -60,18 +80,28 @@ void hello_it_s_me()
 //  gtk_widget_show (my_button);   <   inutile (appels récursifs)
 
     gtk_window_set_child(GTK_WINDOW(my_window), GTK_WIDGET(my_box));
+
+    my_store = gtk_list_store_new (1, G_TYPE_STRING);   //   G_TYPE_CHAR);
+    populate_tree_model (my_store);
+    my_tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL (my_store));
+    my_renderer = gtk_cell_renderer_text_new ();
+
+    g_object_unref (G_OBJECT (my_store));
+
     gtk_widget_show (my_window);
 
-    printf("A little window is created in bac-a-sable with title : %s\n", my_window_title);
+    printf("Window ('%s') with button ('%s')  -[see the sand box]-\nhash_table_size = %d\n",
+           my_window_title, my_button_title, my_hash_table_size);
 }
 
 //------------------------------------------------------------------------------
 
 //  guix shell -m manifest.scm       make clean && clear && time make run
-//  GOBJECT_DEBUG=instance_count     Gio  Gnome input output
+//  GOBJECT_DEBUG=instance_count     GIO  Gnome Input Output
 
 // https://docs.gtk.org/
 // https://docs.gtk.org/gtk4/
+// https://docs.gtk.org/gobject/
 // https://docs.gtk.org/glib/
 // https://docs.gtk.org/gio/
 //
@@ -84,4 +114,14 @@ void hello_it_s_me()
 // https://developer-old.gnome.org/gtk4/stable/GtkListView.html  <<<  copy that !
 // https://docs.gtk.org/gtk4/ctor.TreeListModel.new.html ***
 // https://blog.gtk.org/2020/06/08/more-on-lists-in-gtk-4/ ***
+//
+//
+//
+/* Ce qui suit est compilé  2024-01-18 */
+/* my_hash_table = g_hash_table_new(NULL, NULL); */
+/* my_hash_table = g_hash_table_ref (my_hash_table); */
+/* // gpointer my_key = ; gboolean my_bool = g_hash_table_add (my_hash_table, mykey); */
+/* my_hash_table_size = g_hash_table_size(my_hash_table); */
+
+