>From a method, how can you setfocus on an optionGroup...?

The optiongroup is a container and cannot get focus. However you can set focus on one of the buttons in the optiongroup.

Thisform.optiongroup1.Buttons(1).SetFocus()

Or you can create OptionGroup class and add SetFocus() to it

* OptionGroup class
* PROCEDURE setfocus
  This.Buttons(1).SetFocus()
... 
* Some form's method
Thisform.optiongroup1.SetFocus()