gtk_cell_layout_add_attribute (GTK_CELL_LAYOUT (cb), renderer, "text", 0);
gtk_combo_box_set_model (GTK_COMBO_BOX (cb), GTK_TREE_MODEL (list));
gtk_cell_layout_add_attribute (GTK_CELL_LAYOUT (cb), renderer, "text", 0);
gtk_combo_box_set_model (GTK_COMBO_BOX (cb), GTK_TREE_MODEL (list));