Then I would add a timer that check for the Window (Show) State on the regular interval, compares the current Window state with the previous, and refresh/update the form/values upon specified conditions.
To get the Window (Show) State you can follow the approach
http://www.news2news.com/vfp/?example=263&function=410 based on the window handle. In VFP5 you probably may use GetActiveWindow() to get the handle.
>No, I mean the Windows window that you can click on the tool-bar