diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index e41d540..d64eeeb 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -182,7 +182,8 @@ do_tree_store (GtkWidget *do_widget)
       GtkWidget *vbox;
       GtkWidget *sw;
       GtkWidget *treeview;
-      GtkTreeModel *model;
+      GtkTreeModel *tree_model;
+      GtkTreeStore *tree_store;
 
       /* create window, etc */
       window = gtk_window_new ();
@@ -207,14 +208,16 @@ do_tree_store (GtkWidget *do_widget)
                                       GTK_POLICY_AUTOMATIC);
       gtk_box_append (GTK_BOX (vbox), sw);
 
-      /* create model */
-      model = create_model ();
+      /* create tree_model */
+      tree_model = create_model ();
+      // tree_store = gtk_tree_store_new (NUM_COLUMNS, G_TYPE_STRING);
+      // tree_model = create_node_recursive ((GtkTreeModel) tree_store, O);
 
       /* create tree view */
-      treeview = gtk_tree_view_new_with_model (model);
+      treeview = gtk_tree_view_new_with_model (tree_model);
       gtk_widget_set_vexpand (treeview, TRUE);
       gtk_tree_view_set_reorderable (GTK_TREE_VIEW (treeview), TRUE);
-      g_object_unref (model);
+      g_object_unref (tree_model);
       gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (treeview)),
                                    GTK_SELECTION_MULTIPLE);