<?xml version="1.0" encoding="utf-8"?>
  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  
          <mx:Script>
                  <![CDATA[
                          import mx.collections.SortField;
                          import mx.collections.Sort;
                          import mx.collections.ArrayCollection;
                          
                          [Bindable]
                          public var myCollection:ArrayCollection = new ArrayCollection
                          (
                                  [
                                          {label: "A"},
                                          {label: "B"},
                                          {label: "C"},
                                          {label: "D"},
                                          {label: "E"}
                                  ]
                          );
                          
                          public function sortCollection():void
                          {
                                  var sort:Sort = new Sort();
                                  sort.fields = [new SortField("label", true, true)];
                                  myCollection.sort = sort;
                                  myCollection.refresh();
                          }
                          
                  ]]>
          </mx:Script>
          
          <mx:List dataProvider="{myCollection}" width="200" />
          <mx:Button label="Sort Collection" click="sortCollection()" />
          
  </mx:Application>