Problem with Dynamically created Button and Assosiated Sprite

//HeaderButton.as 
//import flash.display.MovieClip;
 
package
{
	class HeaderButton extends MovieClip
	{
		const btnWidth = 109;
		const btnHeight = 22;		
		
		static var btnInitX;
		static var btnInitY;
		static var btnDX; // x position multiplier
				
		public var m_home_button;
		public var m_home_hit_button;
		
		public function HeaderButton ( btnNum, theMainLabel, altLable1, altLabel2 )
		{
				var btnName:Button_Main = new Button_Main(); // animatable MC linked from lib 
				btnName.x = btnInitX + (btnDX *btnNum);
				btnName.y = btnInitY;
				btnName.myLabel = theMainLabel;
				btnName.myAltLabel1 = altLable1;
				btnName.myAltLabel2 = altLabel2;
				
				
				// ADD BUTTON HIT
				var hitName:hitbutton = new hitbutton(); // this is actually a button linked from lib
				hitName.width = btnWidth;
				hitName.height = btnHeight+10;
				hitName.x = btnInitY + (btnDX * btnNum);
				hitName.y = 15;
				hitName.addEventListener(MouseEvent.MOUSE_OVER,doMouseOver);
				
				addChild(btnName);
				addChild(hitName);
		}
		
		private function doMouseOver(e:MouseEvent):void
		{
			trace("Activate Home button... " + e.target);
			m_home_button.gotoAndStop("stop");
		}
	}
}
// This is how you call it
 
// Stage code
 
// Initialize static variables
HeaderButton::btnInitX = 64;
HeaderButton::btnInitY = 30;
HeaderButton::btnDX = 111.5; // x position multiplier
 
// Build the Menu
var l_menu_buttons:Object; // an array of HeaderButton Classes
l_menu_buttons = new Object ();
 
// Create the Home Button
l_menu_buttons[0] = new HeaderButton ( 0, "HOME", "", "" ); 
// create the Menu Buttons
l_menu_buttons[1] = new HeaderButton ( 1, "Item A", "", "");
l_menu_buttons[1].m_home_button = l_header_buttons[0];
l_menu_buttons[2] = new HeaderButton ( 2, "", "Hello", "World")
l_menu_buttons[2].m_home_button = l_header_buttons[0];
 
// Add all the buttons to the parent (stage?)
for each ( var button in l_menu_buttons )
{
	addChild ( button );
} 
                                              

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