diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index 875d488..8d33e31 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -69,13 +69,15 @@ static TreeItem A[] = {{ "C", C }, { "D", D }, { NULL }};
 static TreeItem R[] = {{ "A", A }, { "B", B }, { NULL }};
 static TreeItem O[] = {{ "R", R }, { NULL }}; //  Artefact added for symetry
 
+//  iterate_node(model, item_0, item_1, &iter, &child_iter);
 static GtkTreeModel *
 iterate_node(GtkTreeStore *model,
              TreeItem    *item_parent,  TreeItem    *item_children,
-             GtkTreeIter *iter_parent,  GtkTreeIter *iter_children)
-{
-  printf("parent, children : %s -> %s    %p -> %p    %p -> %p\n",\
+             GtkTreeIter iter_parent,  GtkTreeIter iter_children)
+{  printf("parent, children : %s -> %s    %p -> %p    %p -> %p    %p -> %p    %p -> %p\n",\
          item_parent->label, item_children->label,\
+         item_parent, item_children,
+         &item_parent, &item_children,
          iter_parent, iter_children,
          &iter_parent, &iter_children);
   /* gtk_tree_store_append (model, &iter_children, &iter_parent); */
@@ -91,21 +93,21 @@ create_model (void)
   TreeItem *item_0 = O->children;
   while (item_0->label) {
       GtkTreeIter iter;
-      iterate_node(model, O, item_0, model, &iter);
+   //   iterate_node(model, O, item_0, (GtkTreeIter) model, iter);
       gtk_tree_store_append (model, &iter, NULL);
       gtk_tree_store_set (model, &iter, COLUMN_0, item_0->label, -1);
 
       TreeItem *item_1 = item_0->children;
       while (item_1->label) {
           GtkTreeIter child_iter;
-          iterate_node(model, item_0, item_1, &iter, &child_iter);
+          iterate_node(model, item_0, item_1, iter, child_iter);
           gtk_tree_store_append (model, &child_iter, &iter);
           gtk_tree_store_set (model, &child_iter, COLUMN_0, item_1->label, -1);
 
           TreeItem *item_2 = item_1->children;
           while (item_2->label) {
               GtkTreeIter child_child_iter;
-              iterate_node(model, item_1, item_2, &child_iter, &child_child_iter);
+              iterate_node(model, item_1, item_2, child_iter, child_child_iter);
               gtk_tree_store_append (model, &child_child_iter, &child_iter);
               gtk_tree_store_set (model, &child_child_iter, COLUMN_0, item_2->label, -1);