Setting this attribute causes the object to clear the current directory (if any) and start loading a new one. MUIA_Dirlist_Status will be set to MUIV_Dirlist_Status_Reading and the sub task will be launched.
By listening to MUIA_Dirlist_Status, you can learn if the directory reading is completed or if something went wrong.
A value of NULL just clears the current directory and sets MUIA_Dirlist_Status to MUIV_Dirlist_Status_Invalid.