title: AdvancedDataGrid dataFields refresh
body: <p>I have a problem with an AdvancedDataGrid; i want the fields Actual and Estimate to change with the timer function but it doesn't work. It works only by refreshing all the adg with the collapse of the tree structure. I want that if the tree is "exploded" only actual and estimate fields refresh. Sorry for my uncorrect english.
  Here's the code</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;mx:WindowedApplication initialize="init();" xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"&gt;
      &lt;mx:Script&gt;
          &lt;![CDATA[
              import mx.utils.ArrayUtil;
              import mx.collections.*;
              import flash.utils.Timer;
              import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn;
              [Bindable]
              public var randomNumber:Number = new Number
              public function randomValues():Number
              {
              randomNumber=Math.random()*100
              randomNumber*=100
              randomNumber=Math.round(randomNumber)
              randomNumber/=100
              trace(randomNumber)
              return randomNumber
              }   
              public var timer:Timer = new Timer(20);
              public function timing():void{
              timer.addEventListener(TimerEvent.TIMER,function(event:Event):void{randomValues()});
              }
              [Bindable]
              public var dpFlat:ArrayCollection = new ArrayCollection;
              public function dpCollection():ArrayCollection
              {
              dpFlat= new ArrayCollection([
              {Continente:"Europa", Paese:"Italia", Actual:randomValues(), Estimate:randomValues()},
              {Continente:"Europa", Paese:"Germania", Actual:randomValues(), Estimate:randomValues()}
                  ]);
              return dpFlat;
              }
  
              public function init():void{
              dpCollection()
              randomValues()  
              }
  
  
          ]]&gt;
          &lt;/mx:Script&gt;
          &lt;mx:AdvancedDataGrid horizontalScrollPolicy="on" columnWidth="100" resizableColumns="false" id="myADG" width="469" height="223" color="0x323232" initialize="gc.refresh();"&gt;        
                  &lt;mx:dataProvider&gt;
                  &lt;mx:GroupingCollection id="gc" source="{dpCollection()}"&gt;
                      &lt;mx:grouping&gt;
                          &lt;mx:Grouping&gt;
                              &lt;mx:GroupingField name="Continente"/&gt;
                              &lt;mx:GroupingField name="Paese"/&gt;
                          &lt;/mx:Grouping&gt;
                      &lt;/mx:grouping&gt;
                  &lt;/mx:GroupingCollection&gt;
                  &lt;/mx:dataProvider&gt;        
  
              &lt;mx:columns&gt;
                  &lt;mx:AdvancedDataGridColumn dataField="Continente"/&gt;
                  &lt;mx:AdvancedDataGridColumn dataField="Paese"/&gt;
                  &lt;mx:AdvancedDataGridColumn id="act" dataField="Actual"/&gt;
                  &lt;mx:AdvancedDataGridColumn id="est" dataField="Estimate"/&gt;
  
  
              &lt;/mx:columns&gt;
      &lt;/mx:AdvancedDataGrid&gt;
      &lt;mx:TextArea text="{randomNumber}" x="477" y="10"/&gt;
      &lt;mx:Button click="timing()" x="10" y="231" label="Start timing function"/&gt;
      &lt;mx:Button click="timer.start()" x="161" y="231" label="Start the time"/&gt;
      &lt;mx:Button click="timer.stop()" x="275" y="231" label="Stop the time"/&gt;
  &lt;/mx:WindowedApplication&gt;
  </code></pre>