added SHOW_CUSTOM_CALLBACK_WORK define to the FM-common.php Demo code to turn the special filtering example code on/off simply by changing the define at the top of the file.
added SHOW_CUSTOM_CALLBACK_WORK define to the FM-common.php Demo code to turn the special filtering example code on/off simply by changing the define at the top of the file.

cpojer/mootools-filemanager,cpojer/mootools-filemanager