diff --git a/(notes) b/(notes)
index 9651f6b..9d4cd8d 100644
--- a/(notes)
+++ b/(notes)
@@ -6,7 +6,8 @@ https://docs.gtk.org/gtk4/class.Widget.html#height-for-width-geometry-management
 //  gtk_window_set_default_size (GTK_WINDOW (a_box), 30, 400);    <    TO STUDY
 https://docs.gtk.org/gtk4/section-text-widget.html     texts
 https://docs.gtk.org/gtk4/drag-and-drop.html           drag-and-drop  
-https://docs.gtk.org/gtk4/class.GestureZoom.html       GtkGestureZoom  
+https://docs.gtk.org/gtk4/class.GestureZoom.html       GtkGestureZoom
+https://docs.gtk.org/gtk4/class.ListView.html
 --------------------------------------------------------------------------------
 
 
diff --git a/hot.c b/hot.c
index c82db18..6f0e1a6 100644
--- a/hot.c
+++ b/hot.c
@@ -13,9 +13,51 @@
 //  GTK_ORIENTATION_VERTICAL       GTK_ORIENTATION_HORIZONTAL
 
 
-static void on_experimental_tree_bind_factory (GtkSignalListItemFactory *factory,
-                           GObject* object,
-                           gpointer user_data);
+static struct TreeNode_t {gchar *text; struct TreeNode_t *child, *next;};
+
+static GListModel* ui_experimental_tree_get_children_model (struct TreeNode_t *parent){
+    GtkStringList *list = NULL;
+    if (parent) {
+        printf("[ui_experimental_tree_get_children_model] here is %s content : ", parent->text);
+        struct TreeNode_t *child = parent->child;
+        if (child) {list = gtk_string_list_new(NULL);}
+        while(child) {
+             gtk_string_list_append(list, child->text);
+             printf("%s ", child->text);
+             child = child->next;
+        }
+    }
+    printf("\n");
+    return G_LIST_MODEL(list);
+}
+
+static GListModel* ui_experimental_tree_create_model_func (GObject *item, gpointer root){
+    struct TreeNode_t *cur = (struct TreeNode_t *)root;
+    struct TreeNode_t *parent = root;
+    const gchar *string =  gtk_string_object_get_string (GTK_STRING_OBJECT(item));
+    while (cur) {
+        if (strcmp(string, cur->text) == 0) break;
+        cur = cur->next;
+        if (cur == NULL) {cur = parent->child; parent = cur;}
+    }
+    printf("[ui_experimental_tree_create_model_func] looked for %s in %s item\n", cur->text, string);
+    return ui_experimental_tree_get_children_model(cur);
+}
+
+static void on_experimental_tree_bind_factory (GtkSignalListItemFactory *factory, GObject* object, gpointer user_data){
+    GtkListItem *list_item = GTK_LIST_ITEM (object);
+    GtkTreeListRow *row = gtk_list_item_get_item (list_item);
+    if (row != NULL) {
+        const gchar *text = gtk_string_object_get_string (GTK_STRING_OBJECT (gtk_tree_list_row_get_item (row)));
+        GtkWidget *expander = gtk_list_item_get_child (list_item);
+        gtk_expander_set_label (GTK_EXPANDER (expander), text);
+        // g_signal_handlers_disconnect_by_func(expander, G_CALLBACK(on_tree_expander_toggled), row);
+        // g_signal_connect(expander, "activate", G_CALLBACK(on_tree_expander_toggled), row);
+        gtk_widget_set_margin_start(expander, gtk_tree_list_row_get_depth(row)*20);
+        gboolean is_expanded = gtk_tree_list_row_get_expanded(row);
+        printf("[on_experimental_tree_bind_factory] row != NULL  here is %s content and expander is %d\n", text, is_expanded);
+    } else printf("[on_experimental_tree_bind_factory] row == NULL\n");
+}
 
 static void on_experimental_expander_toggled(GtkExpander *expander, gpointer user_data){
   gtk_expander_set_expanded (expander, gtk_expander_get_expanded (expander));
@@ -31,6 +73,23 @@ void on_experimental_tree_setup_factory (GtkSignalListItemFactory *factory,
     printf("[on_experimental_tree_setup_factory] here is an expander\n");
 }
 
+static struct TreeNode_t *create_tree_node (const gchar* text){
+    struct TreeNode_t *node = g_malloc0 (sizeof(struct TreeNode_t));
+    node->text = g_strdup(text);
+    node->child = NULL;
+    return node;
+}
+
+static void add_child_node (struct TreeNode_t *parent, struct TreeNode_t *child){
+    if (parent->child) {
+        struct TreeNode_t *cur = parent->child;
+        while (cur && cur->next) {
+            cur = cur->next;
+        }
+        cur->next = child;
+    } else parent->child = child;
+}
+
 void create_experimental_tree (GtkBox *experimental_box){
     GtkSignalListItemFactory *factory = GTK_SIGNAL_LIST_ITEM_FACTORY (gtk_signal_list_item_factory_new ());
     g_signal_connect (factory, "setup", G_CALLBACK(on_experimental_tree_setup_factory), NULL);
@@ -49,49 +108,3 @@ void create_experimental_tree (GtkBox *experimental_box){
   gtk_box_append (experimental_box, GTK_WIDGET (it_s_me));
 }
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-static void on_experimental_tree_bind_factory (GtkSignalListItemFactory *factory,
-                           GObject* object,
-                           gpointer user_data)
-{
-//    GObject *item;
-    const gchar *text;
-    GtkTreeListRow *row;
-    GtkListItem *list_item;
-    GtkWidget *expander;
-
-    list_item= GTK_LIST_ITEM(object);
-    row = gtk_list_item_get_item(list_item);
-    if (row != NULL) {
-        text = gtk_string_object_get_string(GTK_STRING_OBJECT(gtk_tree_list_row_get_item(row)));
-        expander = gtk_list_item_get_child(list_item);
-        gtk_expander_set_label(GTK_EXPANDER(expander), text);
-
-        // Disconnect previous signal handlers to avoid stacking them
-        //    TODO          g_signal_handlers_disconnect_by_func(expander, G_CALLBACK(on_tree_expander_toggled), row);
-
-        // Connect the signal handler
-        //    TODO          g_signal_connect(expander, "activate", G_CALLBACK(on_tree_expander_toggled), row);
-
-        gtk_widget_set_margin_start(expander, gtk_tree_list_row_get_depth(row)*20);
-        gboolean is_expanded = gtk_tree_list_row_get_expanded(row);
-        printf("[on_experimental_tree_bind_factory] here is %s content and expander is %d\n",
-               text,
-               is_expanded);
-    } else {
-        printf("[on_tree_bind_factory] here is NON content\n");
-    }
-}
diff --git a/hot.o b/hot.o
index e4657a6..7a5af09 100644
Binary files a/hot.o and b/hot.o differ
diff --git a/myprogram b/myprogram
index b25064d..99ca84f 100755
Binary files a/myprogram and b/myprogram differ