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Bidirectional up/down triangles in NSAttributedString?

I've checked the archives, and used UnicodeChecker to check through all of the arrow & triangle characters that are available...

I'd like to make a bidirectional up/down triangle glyph and put it into an NSAttributedString, kind of like the graphic that appears on the right side of a "regular" NSPopUpButton(Cell), or on the right side of the label pop-up when editing a contact in the Address Book application. I see the two individual triangle characters that could be merged together to create such a glyph, 0x25B2 and 0x25BC, but how do I get them to appear together in the same glyph?

If this isn't possible, then how does the Address Book manage to display this mixed character?

Nick Zitzmann
<http://www.chronosnet.com/>
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