treeview = gtk_tree_view_new ();
gtk_widget_show (treeview);
gtk_tree_view_set_rules_hint(GTK_TREE_VIEW(treeview), TRUE);
+ gtk_tree_view_set_grid_lines(GTK_TREE_VIEW(treeview), GTK_TREE_VIEW_GRID_LINES_BOTH);
selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));
gtk_tree_selection_set_mode(selection, GTK_SELECTION_MULTIPLE);