[OS X TeX] Greek Fonts in XeTeX

[Themis Matsoukas]

I am trying to use Greek fonts in xetex but was met with partial  
success:

1. Tones do not show up properly. For example, κύκλος typesets  
with the ύ is missing, while κυκλος typesets correctly.
2. Some standard latex characters do not print: ` and " are two that  
I noticed.
3. Italics and bold don't work. Probably this is because these glyphs  
are missing from the font but I do get bold Greek on other Mac  
applications (e.g. by choosing the Greek keyboard and <apple> B).

To access Greek fonts I have used \setromanfont{Symbol} (should I use  
something different?) and set the keyboard to monotonic Greek. A  
minimal example of my source file is shown below.

thanks

Themis

%&program=xelatex
%&encoding=UTF-8 Unicode

\documentclass{article}
\usepackage{fontspec}
\setromanfont{Symbol}
\begin{document}

κύκλος, κυκλος, ``αβγ''

\end{document}
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