.PP
\fBtop_row\fR and \fBitem_index\fR return \fBERR\fR (the general \fBcurses\fR
error value) if their \fImenu\fP parameter is \fBNULL\fP.
.PP
\fBtop_row\fR and \fBitem_index\fR return \fBERR\fR (the general \fBcurses\fR
error value) if their \fImenu\fP parameter is \fBNULL\fP.