diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index 4d8759f..a7c22f2 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -49,32 +49,15 @@ struct _TreeItem
 enum
 {
   COLUMN_0,
-//  COLUMN_1,
+  COLUMN_1,
   NUM_COLUMNS
 };
 
 /* tree data */
-static TreeItem item_name_0[] =
-{
-  { "C", NULL },
-  { "D", NULL },
-  { NULL }
-};
-
-static TreeItem item_name_1[] =
-{
-  { "E", NULL },
-  { "F", NULL },
-  { "G", NULL },
-  { NULL }
-};
-
-static TreeItem root[] =
-{
-  { "A", item_name_0 },
-  { "B", item_name_1 },
-  { NULL }
-};
+static TreeItem C[] = {{ "H", NULL }, { NULL }};
+static TreeItem A[] = {{ "C", C }, { "D", NULL }, { NULL }};
+static TreeItem B[] = {{ "E", NULL }, { "F", NULL }, { "G", NULL }, { NULL }};
+static TreeItem R[] = {{ "A", A }, { "B", B }, { NULL }};
 
 
 static GtkTreeModel *
@@ -82,7 +65,7 @@ create_model (void)
 {
   GtkTreeStore *model;
   GtkTreeIter iter;
-  TreeItem *item_0 = root;
+  TreeItem *item_0 = R;
 
   /* create tree store */
   model = gtk_tree_store_new (NUM_COLUMNS,
@@ -97,7 +80,7 @@ create_model (void)
       gtk_tree_store_append (model, &iter, NULL);
       gtk_tree_store_set (model, &iter,
                           COLUMN_0, item_0->label,
-//                          COLUMN_1, FALSE,
+                          COLUMN_1, item_1->label,
                           -1);
 
       /* add children */
@@ -108,7 +91,7 @@ create_model (void)
           gtk_tree_store_append (model, &child_iter, &iter);
           gtk_tree_store_set (model, &child_iter,
                               COLUMN_0, item_1->label,
-//                              COLUMN_1, item_1->label,  //  AA,
+                              COLUMN_1, item_1->label,
                               -1);
 
           item_1++;