This method is called automatically for all objects that are flagged as needing to save their data by wpSaveDeferred; however, an object can call this method on itself at any time when a critical instance variable is changed. It is recommended that wpSaveDeferred be used in most cases. If you do choose to use this method, you should not call it from your user-interface thread; instead, you should use a background thread.
This method will cause the wpSaveState method to be called.