Flash AS3 ScrollPane update problem: Flash, AS3, Actionscript, CS3, ScrollPane, ScrollBars, update

Flash AS3 ScrollPane update problem

Hi,
I wonder if anyone can help. I've created a flash object that builds up a set of dynamic movieclips based on XML data. That all works fine, however, as there will be variable amounts of data being imported, I want to place the dynamic movieclips inside a scrollpane that should scroll vertically. The problem is that the scrollpane is not displaying any scrollbars. The dynamic movieclips are being created within a 'holder' mc which is then used as the scrollpane source. I've tried using an update() once the content has loaded but that doesn't make any difference.

Any help would be very much appreciated!

import fl.containers.ScrollPane;
 
var xmlLoader:URLLoader = new URLLoader(); 
var xmlData:XML = new XML();
var strXML:String = "xmlsummary.xml";
var cell_spacing:Number = 0.4180;
  
xmlLoader.addEventListener(Event.COMPLETE, LoadXML); 
  
xmlLoader.load(new URLRequest(strXML)); 
 
var sp:ScrollPane = new ScrollPane();
this.addChild(sp);
 
var mcHolder:MovieClip = new MovieClip();
  
function LoadXML(e:Event):void { 
xmlData = new XML(e.target.data); 
var acids:XMLList = xmlData.aminoacid;
for (var i=0; i<acids.length(); i++){
 
	var pro_mc:MovieClip = new mc_protein();
	pro_mc.y = 45*i+5;
	mcHolder.addChild(pro_mc);
	pro_mc.txtTitle.text = acids[i].@name;
	
	var item_count:Number = 0;
	
	var cells:XMLList = acids[i].item;
	for (var j=0; j<cells.length(); j++)
	{
		if (cells[j].@type == "amino"){
			var cell_mc:MovieClip = new mc_black();
			cell_mc.x = item_count * cell_spacing;
			item_count++;
			
			var feat:String = cells[j].modification;
			if(feat == "F"){
				cell_mc.mc_feat.visible = false;
			}
			
			pro_mc.mc_string.addChild(cell_mc);
		}
			else if(cells[j].@type == "ipep"){
			var cell_mc:MovieClip = new mc_red();
			cell_mc.x = item_count * cell_spacing;
			item_count++;
			
			var feat:String = cells[j].modification;
			if(feat == "F"){
				cell_mc.mc_feat._visible = false;
			}
			
			pro_mc.mc_string.addChild(cell_mc);
		}
	}
}
} 
 
sp.move(10,10);
sp.source = mcHolder;
sp.addEventListener(Event.COMPLETE, completeHandler);
 
function completeHandler(event:Event):void{
	sp.update();
}

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Flash AS3 ScrollPane update problem

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