Funcionou !

O problema era, realmente, o uso da propriedade charCode ao invés de
keyCode. Muito o brigado !
Vou colocar aqui tbm a explicação sobre a diferença dessas duas
propriedades (retirado do livedocs)

Understanding the keyCode and charCode properties

You can access the keyCode and charCode properties to determine what
key was pressed and trigger other actions as a result. The keyCode
property is a numeric value that corresponds to the value of a key on
the keyboard. The charCode property is the numeric value of that key
in the current character set (the default character set is UTF-8,
which supports ASCII). The primary difference between the key code and
character values is that a key code value represents a particular key
on the keyboard (the 1 on a keypad is different than the 1 in the top
row, but the 1 on the keyboard and the key that generates the ! are
the same key), and the character value represents a particular
character (the R and r characters are different).

Fonte: http://livedocs.adobe.com/flex/3/html/help.html?content=events_11.html

Abração e até mais.
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