I think the only way is to hook on timer, detect changes and research the ds when event occured.
se Tutorial_Timer form for example of work with a timer -- http://axaptapedia.com/tabax - get new version of the open source taskbar for Dynamics Ax Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/development-axapta/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/development-axapta/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/

