------ MAIN FLEX APPLICATION MXML FILE

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="695">
	<mx:Script>
		<![CDATA[
		import Livehubs.LHDocument;
		private var lhdoc:LHDocument = new LHDocument(this as Livehubs);
		]]>
	</mx:Script>
	<mx:Button x="10" y="345" label="Sign in" id="login_button" enabled="true"/>
</mx:Application>

-------- ACTIONSCRIPT

package Livehubs
{
	import flash.display.MovieClip;

	public class LHDocument extends MovieClip
	{
		// ctor
		public function LHDocument(_doc:Livehubs): void
		{
		  // _doc.login_button can't be accessed, says: null object reference
		}
	}
}