ActionScript 3.0 :: DispatchEvent - Create A Listener In My Main Document Class?

I'm trying to dispatch a custom event. So that my main document class can react when a nav button is clicked.I have a navbutton class which creates the dispatch's the event... and is handled by the onNavigate Method...

private function onClick(evt:MouseEvent):void {
//trace(_label.text + ": path = " + _projectNode.@path);
//trace(evt.target._label.text);[code]....

This onNavigate method works perfectly.... however when I try to create a listener in my main document class I don't "hear" the event.Here's part of the code from the main doc class...here's where I register the listener

this.addEventListener("NAVIGATE", doSomething);

here's where I should handle it...

private function doSomething(e:Event) {
trace(e.target.name);
trace(e.target._label.text);