diff --git a/src/ui/sand_box.c b/src/ui/sand_box.c
index 9bb22d5..1c71220 100644
--- a/src/ui/sand_box.c
+++ b/src/ui/sand_box.c
@@ -30,21 +30,29 @@
 
 static void on_destroy (GtkWidget *widget, gpointer data) {if (data) g_print (data);  exit(0);}
 
-static void setup_cb (GtkSignalListItemFactory *self, GtkListItem *my_list_item, gpointer user_data) {
+static void setup_cb (GtkSignalListItemFactory *self, GtkListItem *my_list_item, gpointer user_data)
+{
   GtkWidget *my_label = gtk_label_new (NULL);
   gtk_list_item_set_child (my_list_item, my_label);
   /* Because gtk_list_item_set_child sunk the floating reference of my_label, releasing (unref) isn't necessary for my_label. */
 }
 
-static void bind_cb (GtkSignalListItemFactory *self, GtkListItem *my_list_item, gpointer user_data) {
+static void bind_cb (GtkSignalListItemFactory *self, GtkListItem *my_list_item, gpointer user_data)
+{
   GtkWidget *my_label = gtk_list_item_get_child (my_list_item);
   /* Strobj is owned by the instance. Caller mustn't change or destroy it. */
   GtkStringObject *my_string_object = gtk_list_item_get_item (my_list_item);
   /* The string returned by gtk_string_object_get_string is owned by the instance. */
-  printf("%s\n", gtk_string_object_get_string (my_string_object));
+  //printf("%s\n", gtk_string_object_get_string (my_string_object));
   gtk_label_set_text (GTK_LABEL (my_label), gtk_string_object_get_string (my_string_object));
 }
 
+static void on_selection_change (GtkSelectionModel* self,  guint position, guint n_items, gpointer user_data)
+{
+  printf("Premier élement ayant changé d'état : %d (%d ont changé d'état)\n", position, n_items);
+}
+
+enum { COLUMN_DESCRIPTION };
 
 static void and_now_let_s_climb_that_tree (GtkWidget *in_that_box)
 {
@@ -54,7 +62,7 @@ static void and_now_let_s_climb_that_tree (GtkWidget *in_that_box)
 
     GtkStringList *my_string_list = gtk_string_list_new ((const char * const *) my_array);
 
-    GtkSingleSelection *my_selection_model = gtk_single_selection_new (G_LIST_MODEL (my_string_list));
+    GtkMultiSelection *my_selection_model = gtk_multi_selection_new (G_LIST_MODEL (my_string_list));
 
     if (gtk_single_selection_get_selected_item (my_selection_model))
         gtk_selection_model_selection_changed (my_selection_model, 0, 1);
@@ -63,6 +71,13 @@ static void and_now_let_s_climb_that_tree (GtkWidget *in_that_box)
     GtkListItemFactory *my_factory = gtk_signal_list_item_factory_new ();
     g_signal_connect (my_factory, "setup", G_CALLBACK (setup_cb), NULL);
     g_signal_connect (my_factory, "bind", G_CALLBACK (bind_cb), NULL);
+    g_signal_connect (my_selection_model, "selection-changed", G_CALLBACK (on_selection_change), NULL);
+
+    GtkWidget *treeview;
+    treeview = gtk_tree_view_new_with_model (my_selection_model);
+    gtk_widget_set_vexpand (treeview, TRUE);
+    gtk_tree_view_set_search_column (GTK_TREE_VIEW (treeview),
+                                   COLUMN_DESCRIPTION);
 
     GtkWidget *my_list_view = gtk_list_view_new (GTK_SELECTION_MODEL (my_selection_model), my_factory);
     gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (in_that_box), my_list_view);
@@ -81,7 +96,7 @@ void on_activate_window_creation (GtkApplication *app, gpointer data) {
 
     and_now_let_s_climb_that_tree (my_scrolling_thing);
 
-    if (data) {g_print (data);  g_print (" and is displayed by [sand_box.c  >  on_activate_window_creation()]\n");}
+    if (data) {g_print (data);  g_print (" and is displayed by [sand_box.c / on_activate_window_creation()]\n");}
 }
 
 //------------------------------------------------------------------------------