you can implement such things so users can modify things on-the-fly (i.e. realtime), and from any event that you may wish to be the trigger, i.e. changes in a control (e.g. tab page) reflected in the 'game' realtime, and visa versa. oh, and here is an link to a brief example of how it could be done (seems OP Athos1984 already has it, so placing it here may be a good reference for others too): http://www.gamedev.net/community/forums/topic.asp?topic\_id=499979 modified on Tuesday, July 8, 2008 7:26 PM