Preloaders as Transitions...Best practices

When using preloaders as transitions between external swfs, what is the best way to load them into at container clip in the main movie?

Is it simply?

on (press) {
containermc.loadMovie(“clip.swf”);
}

Here’s why I ask…

I designed a site where external movies are dynamically loaded into a main movie that has buttons for navigation.

I used this tutorial and everything worked perfectly:
http://www.kirupa.com/developer/mx2004/transitions.htm

I got fancy and changed the preloaders of my external movies, from a standard bar preloader to an advanced preloader with tweens using this tutorial:
http://www.kirupa.com/developer/actionscript/tween_as_preloader.htm

I usually keep all my content in the main timeline, but this tutorial suggested putting the preloader in a seperate scene.

Changing the preloaders has now made the navigation I built from the first tutorial slightly buggy. If I press a button while the movie is in transition, buttons in the main movie stop working and I have to click several buttons in no particular order to get the external swfs loading again…T

It’s probably just a matter of modifying the AS I used from the first tutorial (http://www.kirupa.com/developer/mx2004/transitions.htm) to allow for the scene I added for the advanced preloader. Unfortunately my AS skills are limited…

I’d appreciate any input, this navigation bug is annoying…