diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index 27041ad..4d8759f 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -42,7 +42,6 @@ typedef struct _TreeItem TreeItem;
 struct _TreeItem
 {
   const char     *label;
-//  gboolean        AA;
   TreeItem       *children;
 };
 
@@ -50,30 +49,30 @@ struct _TreeItem
 enum
 {
   COLUMN_0,
-  COLUMN_1,
+//  COLUMN_1,
   NUM_COLUMNS
 };
 
 /* tree data */
 static TreeItem item_name_0[] =
 {
-  { "A", NULL },
-  { "B", NULL },
+  { "C", NULL },
+  { "D", NULL },
   { NULL }
 };
 
 static TreeItem item_name_1[] =
 {
-  { "A", NULL },
-  { "B", NULL },
-  { "C", NULL },
+  { "E", NULL },
+  { "F", NULL },
+  { "G", NULL },
   { NULL }
 };
 
 static TreeItem root[] =
 {
-  { "IT-0", item_name_0 },
-  { "IT-1", item_name_1 },
+  { "A", item_name_0 },
+  { "B", item_name_1 },
   { NULL }
 };
 
@@ -98,7 +97,7 @@ 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, FALSE,
                           -1);
 
       /* add children */
@@ -109,7 +108,7 @@ 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,  //  AA,
                               -1);
 
           item_1++;
@@ -130,9 +129,9 @@ add_columns (GtkTreeView *treeview)
   gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview), -1,
       "Col 0", renderer, "text", COLUMN_0, NULL);
 
-  renderer = gtk_cell_renderer_text_new (); g_object_set (renderer, "xalign", 0.0, NULL);
-  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview), -1,
-      "Col 1", renderer, "text", COLUMN_1, NULL);
+  /* renderer = gtk_cell_renderer_text_new (); g_object_set (renderer, "xalign", 0.0, NULL); */
+  /* gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview), -1, */
+  /*     "Col 1", renderer, "text", COLUMN_1, NULL); */
 }
 
 GtkWidget *