XML to ArrayCollection for DataGrid binding

programming flash
1

I want to get my XML into a DataGrid, but I’m not sure of the best method?
Here is where my XML is being set:

   private function resultHandler(event:ResultEvent):void
            {
                var str:String = event.result.toString();
                var arr:Array = str.split('&');
                var xml:XML = <multimedia/>;
                var xn:XML = <item/>;
                var a:Array;
                for(var i:int=0; i<arr.length; i++){
                    a = arr*.split(',');
                    xn = <item/>;
                    for each(var s:String in a){
                        xn.appendChild(pairToXML(s));
                    }
                    xml.appendChild(xn);
                }
                function pairToXML(st:String):XML {
                var xn:XML = <foo/>;
                var xs:Array = st.split('=');
                xn[xs[0]] = xs[1];
                return xn[xs[0]][0];
                }
                **trace(xml.toXMLString());**
            }

so that my trace is=

<multimedia>
  <item>
    <uniqueid>1</uniqueid>
    <mm_name>bluehills.jpg</mm_name>
    <mm_path>img/req1</mm_path>
    <mm_keywords>keyword1</mm_keywords>
  </item>
  <item>
    <uniqueid>2</uniqueid>
    <mm_name>satellite_map.jpg</mm_name>
    <mm_path>img/req2</mm_path>
    <mm_keywords>map satellite</mm_keywords>
  </item>
  <item>
    <uniqueid>3</uniqueid>
    <mm_name>robot.jpg</mm_name>
    <mm_path>img/req2</mm_path>
    <mm_keywords>robot black and white</mm_keywords>
  </item>
</multimedia>

do I have to put this into an ArrayCollection for easy DataGrid binding? and how? any suggestions?