Загадка от адоба. Хотя для AIR есть.
Создайте свой класс, коды вот:

Код AS3:
public static const A:uint = 65;
public static const B:uint = 66;
public static const C:uint = 67;
public static const D:uint = 68;
public static const E:uint = 69;
public static const F:uint = 70;
public static const G:uint = 71;
public static const H:uint = 72;
public static const I:uint = 73;
public static const J:uint = 74;
public static const K:uint = 75;
public static const L:uint = 76;
public static const M:uint = 77;
public static const NUM_0:uint = 96;
public static const NUM_1:uint = 97;
public static const NUM_2:uint = 98;
public static const NUM_3:uint = 99;
public static const NUM_4:uint = 100;
public static const NUM_5:uint = 101;
public static const NUM_6:uint = 102;
public static const NUM_7:uint = 103;
public static const NUM_8:uint = 104;
public static const NUM_9:uint = 105;
public static const NUM_PLUS:uint = 107;
public static const N:uint = 78;
public static const O:uint = 79;
public static const P:uint = 80;
public static const Q:uint = 81;
public static const R:uint = 82;
public static const S:uint = 83;
public static const T:uint = 84;
public static const U:uint = 85;
public static const V:uint = 86;
public static const W:uint = 87;
public static const X:uint = 88;
public static const Y:uint = 89;
public static const Z:uint = 90;
public static const GRAVE:uint = 192;