diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index 2a1d72e..1920eb1 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -51,9 +51,25 @@ enum
 
 static void iterating_a_model_in_a_depth_first_fashion (GtkTreeModel *model)
 {
-  g_print ("iterating_a_model_in_a_depth_first_fashion (GtkTreeModel *model) is not yet implemented  (line 54)\n");
   //  gtk_tree_model_foreach (model, TRUE, my_user_data);  https://developer-old.gnome.org/gtk4/stable/GtkTreeModel.html#GtkTreeModelForeachFunc
   //  gboolean (*GtkTreeModelForeachFunc) (GtkTreeModel *model, GtkTreePath *path,  GtkTreeIter *iter, gpointer data);
+  GtkTreeIter iter;
+  gboolean valid;
+  int row_count = 0;
+  valid = gtk_tree_model_get_iter_first (model, &iter);
+  while (valid)
+ {
+   char *str_data;
+   // Make sure you terminate calls to gtk_tree_model_get() with a “-1” value
+   gtk_tree_model_get (model, &iter, STRING_COLUMN, &str_data, -1);
+   g_print ("Row %d: (%s)    <>     gtk_tree_model_get_iter_first (model, &iter)         &iter = [%s]     (line 67)    ", row_count, str_data, &iter);
+   g_free (str_data);
+   valid = gtk_tree_model_iter_next (model, &iter);
+ //  valid = gtk_tree_model_iter_children (model, &iter, parent);  <<   how to get the parent ??
+   g_print ("valid = %d = gtk_tree_model_iter_next (model, &iter)    %s    (line 71)\n",\
+            valid, gtk_tree_model_get_string_from_iter (model, &iter));
+   row_count++;
+ }
 }
 
 static void  /*  https://developer-old.gnome.org/gtk4/stable/GtkTreeModel.html#GtkTreePath-struct  and  #gtk-tree-row-reference-new   */
@@ -89,7 +105,7 @@ static void acquiring_a_GtkTreeIter (GtkTreeModel *my_tree_model, GtkTreePath *m
 {
   GtkTreeIter iter;  //  get the iterator from a string
   gtk_tree_model_get_iter_from_string (my_tree_model, &iter, "3:2:5");
-  g_print ("acquiring_a_GtkTreeIter from path : [ %s ]\n", gtk_tree_path_to_string (my_tree_path));
+  g_print ("acquiring_a_GtkTreeIter from path : [ %s ]  (lines 225 & 108)\n", gtk_tree_path_to_string (my_tree_path));
 
   my_tree_path = gtk_tree_path_new_from_string ("3:2:5");  //  get the iterator from a path
   gtk_tree_model_get_iter (my_tree_model, &iter, my_tree_path);
@@ -100,25 +116,6 @@ static void acquiring_a_GtkTreeIter (GtkTreeModel *my_tree_model, GtkTreePath *m
   /* parent_iter = iter;  gtk_tree_model_iter_nth_child (my_tree_model, &iter, &parent_iter, 5); */
 }
 
-static void reading_data_from_a_GtkTreeModel(GtkTreeModel *my_tree_model)
-{
-  GtkTreeIter iter; // Get the first iter in the list, check it is valid and walk through the list, reading each row.
-  int row_count = 0;
-  char *my_str_data;
-
-  gboolean valid = gtk_tree_model_get_iter_first (my_tree_model, &iter);
-
-  while (valid) {   // Make sure you terminate calls to gtk_tree_model_get() with a “-1” value
-    gtk_tree_model_get (my_tree_model, &iter, STRING_COLUMN, &my_str_data, -1);
-    g_print ("Row %d: (%s)\n", row_count, my_str_data);
-    valid = gtk_tree_model_iter_next (my_tree_model, &iter); // ? if (gtk_tree_model_iter_next (my_tree_model, &iter)) row_count++; ?
-    row_count++;
-  }
-
-  g_free (my_str_data);   //  ? g_free (iter);
-}
-
-
 /* TreeItem structure */
 typedef struct _TreeItem TreeItem;
 struct _TreeItem
@@ -204,9 +201,8 @@ do_tree_store (GtkWidget *do_widget)
 
       /* create tree_model */
       my_tree_model = create_node_recursive (my_tree_store, O, NULL, 0);
-      reading_data_from_a_GtkTreeModel(my_tree_model);
       iterating_a_model_in_a_depth_first_fashion (my_tree_model);
-      GtkTreePath *my_path = gtk_tree_path_new_from_string ("1:1:1");
+      GtkTreePath *my_path = gtk_tree_path_new_from_string ("0:0:1:0:1");
       acquiring_a_GtkTreeIter (my_tree_model, my_path);
    //   GtkTreeIter *my_iter;   edit_a_cell (my_tree_model, NULL, my_iter, NULL, my_path);