Multiple accents on Greek letter in XeLaTeX [closed]

I'm new to XeLaTeX and having trouble combining a macron and breve over Greek letters. I input \textgreek{ᾱ̆}, but the breve is sitting right on top of the macron. How do I raise it up? Or, alternatively, is there way to make this into a pre-defined glyph?

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closed as too localized by egreg, Kurt, Werner, Martin Schröder, percusseMar 2 '13 at 23:54

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Did you try $\breve{\bar{\alpha}}$? Or are we setting Greek text rather than maths? – Thruston Nov 27 '12 at 23:28
I'm setting Greek text rather than maths, but that gives exactly the output I'm looking for, except that I can't get the alpha to come out as the rest of my Greek text (in the CM font). – DMG Nov 28 '12 at 9:45
Welcome to TeX.sx! Please add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – brian-ammon Dec 1 '12 at 22:33