tree_callback    1116 src/filemanager/boxes.c                       tree_callback, NULL, "[Directory Tree]", _ ("Directory tree"));
tree_callback    1282 src/filemanager/tree.c     widget_init (w, r, tree_callback, tree_mouse_callback);
tree_callback    1337 src/filemanager/tree.c     return (WTree *) widget_find_by_type (CONST_WIDGET (h), tree_callback);