tree_callback    1035 src/filemanager/boxes.c                       tree_callback, NULL, "[Directory Tree]", _("Directory tree"));
tree_callback    1284 src/filemanager/tree.c     widget_init (w, y, x, lines, cols, tree_callback, tree_mouse_callback);
tree_callback    1337 src/filemanager/tree.c     return (WTree *) find_widget_type (h, tree_callback);