Disable button on another level

My main movie is on level 0, of course. On level 0 I created an empty movie clip named “container”. Now, I load another movie into container, and I loaded it on Level 1. Now, I want to put a code inside a Movie Clip that is on level 1, which is the new, loaded movie that will disable a red button on level1. Here’s the code I used:

_level1.redbutton.enabled= false;

That didn’t work, so I went this route:

_root.redbutton.enabled=false;

That worked to no avail as well. So, I’m wondering if the code that disables and enables buttons only work with a handler? Like an onClipEvent or on (release) handler? I’m puzzled right now, because this is really elementary but i just don’t know it right now…any aid will be appreciated…keep flashing