Why the components react so slow?

programming flash
1

I met a very strange problem today, it’s about the “Button” component.

Well, I put a button on the stage and use

myButton.enabled = false;

but it doesn’t go disabled.

You have to “wait for some time” to make it work, or finally, I find using an ‘ADD_TO_STAGE’ event to solve it:

// The constructor of this sprite object
public function MySprite()
{
  super();
  myButton.enabled = false; // NEVER work, WHY ??
  this.addEventListener(EVENT.ADD_TO_STAGE, handler);
}

// a handler
function handler(){
  myButton.enabled = false; // work!
}

I am not sure whether this is the only solution if I have to use components from Flash CS3 …

Anyone knows why? and is my solution a reasonable one?

Thanks in advance.