AS3 - Keyboard Event Not working for certain Keys - actionscript-3

Question

So this is weird, I'm using the exact same Key class that Kongregate.com gives you when you do their "Shootorials." It works nicely for arrow keys, but not so much when you try to use WASD controls. I couldn't get it to recognize the keyCode, so I started typing trace(); statements in the keyPressed event handler.
It turns out that my arrow keys, and some of my other keys like 'D', and 'G' will trigger the event. However other keys don't work. 'A', 'S'.
Why is my class working for some keys and not other keys?
Source Code
package
{
import flash.display.Stage;
import flash.events.Event;
import flash.events.KeyboardEvent;
public class Key {
private static var initialized:Boolean = false;
private static var keysDown:Object = new Object(); // stores key codes of all keys pressed
public static function initialize(stage:Stage) {
if (!initialized) {
// assign listeners for key presses and deactivation of the player
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, keyReleased);
stage.addEventListener(Event.DEACTIVATE, clearKeys);
// mark initialization as true so redundant
// calls do not reassign the event handlers
initialized = true;
trace("Initialized [Keys]");
}
}
public static function isDown(keyCode:uint):Boolean
{
return Boolean(keyCode in keysDown);
}
private static function keyPressed(event:KeyboardEvent):void {
trace("Keyboard Event Trigger");
keysDown[event.keyCode] = true;
}
private static function keyReleased(event:KeyboardEvent):void {
if (event.keyCode in keysDown) {
delete keysDown[event.keyCode];
}
}
private static function clearKeys(event:Event):void {
// clear all keys in keysDown since the player cannot detect keys being pressed or released when not focused
keysDown = new Object();
}
}
}

Answer 1

Did have the same issue once. Mine was tied to the browser i was running. Some browsers seem to highjack some keyboard events and don't let them bubble down to flash player.
Checking for the same issue in other browsers might give you an entry point to solve your problem.

Answer 2

Akos said to check if the browser was hijacking keyboard events. After investigating, I learned that it was my flash player itself that was hijacking my keys. Here's how I fixed it.
Run the .swf in whatever flash Player you desire.
Click 'Control' in the window menu
Check 'Disable Keyboard shortcuts'
Easy fix. Thanks for your help.