\membersection{wxGBSpan::operator!}\label{wxgbspanoperatorunknown}
\constfunc{bool}{operator!}{\param{const wxGBSpan\& }{o}}
Is the wxGBSpan valid? (An invalid wxGBPosition is (-1,-1). )
\membersection{wxGBSpan::operator!}\label{wxgbspanoperatorunknown}
\constfunc{bool}{operator!}{\param{const wxGBSpan\& }{o}}
Is the wxGBSpan valid? (An invalid wxGBPosition is (-1,-1). )