These little things like this will drive me into circles (nuts!). It was so easily solvable though. remarkable that it was really so easy. I looked at the Threads that you referenced; I could see that you had the same exact situation. Thanks for bearing with me. I mean that also for Tamar and Sergey.

Here's the resulting "easy" code:

* .chkGalvRptByBlock.Click()
WITH ThisForm
   IF This.Value = 1
      * CheckBox on.
      .nGalvRptByBlock=2
      .OptionGroup1.Value=2
   ELSE
      * CheckBox off.
      .nGalvRptByBlock=1
   ENDIF
   Refresh()
ENDWITH

>Hi Cecil,

>I think I had this problem before. Please check the whole thread Re: Bug with option group in VFP6? Thread #830472 Message #830587