-\twocolitem{{\bf wx\_NO\_DEFAULT}}{Used with {\bf wxYES\_NO}, makes {\bf No} button the default.}
-\twocolitem{{\bf wxCENTRE}}{Centre the message. Not Windows.}
+\twocolitem{{\bf wxYES\_DEFAULT}}{Used with {\bf wxYES\_NO}, makes {\bf Yes} button the default - which is the default behaviour.}
+\twocolitem{{\bf wxNO\_DEFAULT}}{Used with {\bf wxYES\_NO}, makes {\bf No} button the default.}