Struggling filtering an XMLList from another XMLList (Actionscript 3.0)

Hi,

I'm trying to build something of a document library at work.  There will probably be two main filters (insurance class and type of document) which I'd like users to be able to select to filter the list of documents.

I've been trying to have two list boxes at the top interact using XMLLists and DataProviders.  Something very similar in fact to the Adobe Video Workshop - the way they have the two selections above the list of videos.  

I've enclosed the code below of where I'm upto.  I can get it to display both lists (XML at the bottom), but I'd like to be able to say click on Property and have the second list reflect only document types applicable to Property.

On my stage i have the businessDP and typeDP lists.  

Hope this makes sense, if I need to post anymore I will!

Thanks,
John  

import fl.data.DataProvider;
 
var selectedBusiness:Object = new Object();
var selectedType:Object = new Object();
var businesses:XMLList = new XMLList();
var types:XMLList = new XMLList();
 
var businessDP:DataProvider = new DataProvider();
business.dataProvider = businessDP;
business.addEventListener(Event.CHANGE, changeBusiness);
 
var typeDP:DataProvider = new DataProvider();
type.dataProvider = typeDP;
type.addEventListener(Event.CHANGE, changeType);
 
function changeBusiness(event:Object):void {
	selectedBusiness = business.selectedItem;
} 	
 
function changeType(event:Object):void {
	selectedType = type.selectedItem;
} 	
 
// load the XML file
var myXMLLoader:URLLoader = new URLLoader();
myXMLLoader.load(new URLRequest("assets/SampleDocLibrary.xml"));
myXMLLoader.addEventListener(Event.COMPLETE, myXMLLoadedHandler);
 
function myXMLLoadedHandler(eventObj:Event):void {
	var businessXML = new XML(eventObj.currentTarget.data);
	businesses = businessXML.children()[0].children();	
	
	var typesXML = new XML(eventObj.currentTarget.data);
	types = typesXML.children()[1].children();	
	
	setBusinesses();
	setTypes();
	//typeText.text = typesXML.children().children()[6];
}
 
function setBusinesses():void {
	var i:int = 0;
	for each(var prop:XML in businesses) {
		var businessData:XML = prop;
		businessDP.addItem( { label:businessData.@label, data:businessData.@data } );
		i++;
	}	
	selectedBusiness = business.dataProvider.getItemAt(0);
}
 
function setTypes():void {
	var i:int = 0;
	for each(var prop:XML in types) {
		var typeData:XML = prop;
		typeDP.addItem( { label:typeData.@name, data:typeData.@code } );
		i++;
	}	
	selectedType = type.dataProvider.getItemAt(0);
}
 
 
<!---------------------------------------- XML ---------------------------------------->
 
<dataset>
	<businesses>
		<business label="Property" data="prop"/>
		<business label="Liability" data="liab"/>
		<business label="Household" data="hous"/>
		<business label="Motor" data="moto"/>
		<business label="ProFin" data="prof"/>
		<business label="Marine" data="mari"/>
	</businesses>
	<types>
		<type name="British Standard" code="bs" lob="prop"/>
		<type name="Guide" code="gd" lob="liab"/>
	</types>
</dataset>

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