Keyboard events are from the stage. You want to do:


addEventListener(Event.ADDED_TO_STAGE, onStage);
function onStage(e:Event):void {
removeEventListener(Event.ADDED_TO_STAGE, onStage);
stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
addEventListener(Event.REMOVED_FROM_STAGE, offStage);
}

function offStage(e:Event):void {
removeEventListener(Event.REMOVED_FROM_STAGE, offStage);
stage.removeEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
}


If you want to move your character, it makes sense to add the whole thing to MainCharacter.as:

When your character is added to the stage, he starts listening for key events. When one is pressed, some property changes (position or whatever else).
When your character gets removed from the stage, make sure to remove all those event listeners that he was listening to. Now he can't move anyway...

Can you paste the code in question?

Thanks greenvertex for your response.

But crap I can't get it move. It doesn't show any error.

I paste your code and show and error that onKeyDown was not found, so I change it for the name of the function that I want to run and nothing.

Then I add the instance of the Main.as, where everything is getting add, and nothing either.

What can be??

Thanks for your time greenvertex !!

If you want handle whole keyboard events for control game object, use stage, and not your custom objects.
When you add keyboard event listener to stage, this is applied for all of your objects (this is not trully in lower-level of action script, but you can imaginate it like I said ).
Just like a simple example:
[source lang="java"]myGameObject.stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);[/source]

[quote name='Deft' timestamp='1346277154' post='4974589']
If you want handle whole keyboard events for control game object, use stage, and not your custom objects.

I CAN'T believe it !! It worked !!

My God I have hours on this and finally got it, thanks to you !!!

BTW, can you explain me a little more about this?! I want to learn ;)

Thanks SO SO much Deft, you are the man of the day !!
[/quote]
The thing is keyboard events working only when user focused on it.
For example, you can't input into text area until you'll not selected it by clicking mouse or click "tab-tab-tab" to go into area (this is mean focus). When your pointer blinking in input area, you can enter characters. Yeap? This mean that you was focused on text area. For another object, such as text labels and other (including sprites/movie clips/etc.) focus rules are the same.
So, your keyboard events didn't worked because of your game object wasn't focused. So adding global KB event onto display object is not better choice. Just do KB handling on the stage, that is focused always by default (again, this is not same on low-level, but you understand what I mean)

P.S. But if you want implement such things like a input fields, you need to add KB event only onto object itself.