I noticed this in the examples :-
// Don't know how to write this in C++ ...
// XLS->Sheet[ 0 ]->Cell[ 0][1 ]->FontStyle = [xfsBold,xfsItalic];
I program in C++ and this is how you do it :-
XLS->Sheet[ 0 ]->Cell[ 0][1 ]->FontStyle = XLS->Sheet[ 0 ]->Cell[ 0][1 ]->FontStyle <<xfsBold <<xfsItalic;
HTH,
Graphic