Parent/Child type casting error?

Hi,

First off I'm more of a C++ programmer and so I'm wrapping my head around Flash's framework.

What I'm attempting to achieve here is have certain 'stuff' happen when I roll-over a button which is nested in the parent. However, Flash is claiming that it's the wrong root of passage by not actually working. The roll-over works, as I've done tests in the _root of the page; but when I'm type casting to the a child it claims it's wrong. Any help would be appreciated.

Here's an image to illustrate that everything is okay.

http://gyazo.com/f7312e0d0fc5e4bb200...png?1337954359

Here is my code.

Code:

---

_root.menucontainer.class_box.sm_classImage.menuclassone.onRollOver = function() {
        createTextField("dynamic_txt", 1, 10, 10, 150, 30);
        dynamic_txt.text = "Here's some text";
        dynamic_txt.textColor = 0x00cc00;
        dynamic_txt.border = true;
};

---

Trying to understand what isn't working. I understand you are having trouble casting to the correct level, and you said the roll over part is working....what and where are you attempting to cast?