GtkType gtk_tree_item_get_type (void);
GtkWidget* gtk_tree_item_new (void);
-GtkWidget* gtk_tree_item_new_with_label (gchar *label);
+GtkWidget* gtk_tree_item_new_with_label (const gchar *label);
void gtk_tree_item_set_subtree (GtkTreeItem *tree_item,
GtkWidget *subtree);
void gtk_tree_item_remove_subtree (GtkTreeItem *tree_item);