Buttons problem

hello. I have a drop down menu. i set it up so that at the release of each button, the preloader is supposed to load a swf into a movieclip container. however, i am having trouble trying to target my drop down menu buttons from the actionscript panel on the main timeline.

Note that the buttons i am trying to target are inside a movieclip button.

Also, all of my buttons have instance names.
-preloader instance name = myPreloader
-movieclip container instance name = myLoader
-main movie clip button instance name = btnMusic
-drop down button instance name = btnHiphop

What would be the correct script to tell one of my drop down menu buttons to tell my preloader to load an external swf onto a movieclip container?

Here is what I currently have now:

this.btnMusic.btnHiphop.onRelease=function() {
swfPreloader.loadFile(“hiphop.swf”, “myLoader”, “.swf”);
}

Obviously this is not correct.

Please help. Thanks in advance.