Target path for btn in mc in mc?

I am a starting Flash amateur and I am very impressed with this site… wow!
So much to learn…

I have read through the forum and some tutorials, but I can’t find my solution. Perhaps I missed it?
Therefor I will try it this way; hopefully someone can help me. The following is the problem:

In my ‘main’ scene I have a menu (consisting of btn symbols).
When you click on a btn, an external swf file is loaded into a movieClipLoader component (mainLoader). Also, a sub menu appears (ie subMenu1_mc).
This sub menu mc again contains some btns in a mc (sub1_mc).

Now, I can’t seem to activate these btns through AS and load the external swf into the loader!

The target option in AS gives me the path:
[COLOR=blue]this[/COLOR].subMenu1_mc.sub1_mc.btnProfiel_btn (the btn IS recognized… and the rollOver state works too).

To me, the logical AS code (in the main timeline) for the btn was as followed:

[COLOR=blue]this[/COLOR].subMenu1_mc.sub1_mc.btnProfile_btn.[COLOR=blue]onRelease[/COLOR] = [COLOR=blue]function[/COLOR] () {
mcLoader.[COLOR=blue]loadClip/COLOR;
}

… but of course, this doesn’t work. Except for the rollOver effect, nothing happens.

What am I doing wrong? If more specifications are needed, please let me know!

John