tree_callback    1090 src/filemanager/boxes.c                       tree_callback, NULL, "[Directory Tree]", _("Directory tree"));
tree_callback    1283 src/filemanager/tree.c     widget_init (w, r, tree_callback, tree_mouse_callback);
tree_callback    1338 src/filemanager/tree.c     return (WTree *) widget_find_by_type (CONST_WIDGET (h), tree_callback);