group and when an item in the group is checked, all the others are
automatically unchecked.
-{\bf NB:} Currently only implemented under Windows and GTK, use
-{\tt\#if wxHAS\_RADIO\_MENU\_ITEMS} to test for availability of this feature.
-
\wxheading{See also}
\helpref{wxMenu::Append}{wxmenuappend},\rtfsp