Peter,

Thanks again for your very kind assistance.
All your comments have indeed helped me to take a new perspective
at this problem ... I was totally stuck ... and over-complicating
things ...

Finally, going step by step, just found the simplest solution :
Set CmdBtn = UserForm1.Controls("CommandButton" & i)
CmdBtn.Value = True

Hope it will help future readers.
Again thanks for sharing all your thoughts
Best Regards
Carim