diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index f79656b..27041ad 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -42,8 +42,7 @@ typedef struct _TreeItem TreeItem;
 struct _TreeItem
 {
   const char     *label;
-  gboolean        AA;
-//  gboolean        CC;
+//  gboolean        AA;
   TreeItem       *children;
 };
 
@@ -52,31 +51,29 @@ enum
 {
   COLUMN_0,
   COLUMN_1,
-
-//  VISIBLE_COLUMN,
   NUM_COLUMNS
 };
 
 /* tree data */
 static TreeItem item_name_0[] =
 {
-  { "A", TRUE, NULL },
-  { "B", FALSE, NULL },
+  { "A", NULL },
+  { "B", NULL },
   { NULL }
 };
 
 static TreeItem item_name_1[] =
 {
-  { "A", FALSE, NULL },
-  { "B", TRUE, NULL },
-  { "C", FALSE, NULL },
+  { "A", NULL },
+  { "B", NULL },
+  { "C", NULL },
   { NULL }
 };
 
 static TreeItem root[] =
 {
-  { "IT-0", FALSE, item_name_0 },
-  { "IT-1", FALSE, item_name_1 },
+  { "IT-0", item_name_0 },
+  { "IT-1", item_name_1 },
   { NULL }
 };
 
@@ -91,9 +88,6 @@ create_model (void)
   /* create tree store */
   model = gtk_tree_store_new (NUM_COLUMNS,
                               G_TYPE_STRING,
-                              G_TYPE_BOOLEAN,
-                              G_TYPE_BOOLEAN,
-                              G_TYPE_BOOLEAN,
                               G_TYPE_BOOLEAN);
 
   /* add data to the tree store */
@@ -105,7 +99,6 @@ create_model (void)
       gtk_tree_store_set (model, &iter,
                           COLUMN_0, item_0->label,
                           COLUMN_1, FALSE,
-                    //      VISIBLE_COLUMN, FALSE,
                           -1);
 
       /* add children */
@@ -116,8 +109,7 @@ 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->AA,
-                       //       VISIBLE_COLUMN, TRUE,
+                              COLUMN_1, item_1->label,  //  AA,
                               -1);
 
           item_1++;