Nested button question

hello all,

on the main stage I have these movieClips

nav_mc - navigation movieclip
main_mc - main movieclip

in my action layers I have this:

//defines button
var master_btn:Button; - this is a nested btn inside of nav_mc

// nested nav button actions
nav_mc.master_btn.onPress=function(){
_parent.main_mc.gotoAndStop(“master”);
}

it does not move the playhead inside of the main_mc… any thoughts…?

thanks
Aaron