Controlling movieclips in loaded levels?!

[Tautz]

Hi.
Here is the example, I have interface with buttons..every button has a submenu with 4 buttons. As I click one of the submenu buttons it should load external *.swf to a leveln. Even more, every submenu button must direct to a different frame in that loaded leveln *.swf.
My problem is that if I am trying to make the loaded movie to go to frame 2...I just cant get it work.
Here is the AS I have assigned to a button what has to load an external *.swf to level 4 and open frame 1 in buttonbar movie clip.

on (press) {
loadMovieNum("5.1.swf", 4);
_level4.buttonbar.gotoAndStop(1);
}

With that I am having no problems. Problems occur when I am adding a script for second button.

on (press) {
loadMovieNum("5.1.swf", 4);
_level4.buttonbar.gotoAndStop(2);
}

This should load *.swf called 5.1 to level 4 and stop in a second frame in bottonbar movieclip.
But with this script, it aint working. It goes to 1'th frame in buttonbar and stops there, but I want it to go to 2'd frame and stop there. So I am suspecting that here is something wrong with AS.
Any ideas...any help would be greatly apprecciated. Thank you for ur time