Uppercase greek letters in math in italic/slanted format

I read that in math, capital Greek letters should be italic, just like all the other (Latin alphabet) letters. How do I do this? I use \usepackage[charter]{mathdesign} as my font.

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This is a style decision; some typographic tradition, for instance in France, want capital Greek in italics, others (British and American) want them upright. –  egreg Oct 27 '12 at 15:00
@egreg isn't it rather that the French want their lowercase Greek upright? –  jfbu Oct 27 '12 at 15:44
–  amcnabb Sep 13 '13 at 20:09