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How to access (reference) custom itemRenderer in TileList?
public function myFunction(evt:Event):void
{
  for each (var o:MyObject in myDataProvider)
  {
    o.someProperty = "Updated";
  }

  myArrayCollection.refresh();
}

<fx:Script>
  <![CDATA[

  public function myFunction(evt:Event):void
  {
    trace(MyObject(myList.selectedItem).someProperty.toString());
  }

  ]]>
</fx:Script>

<mx:List id="myList" dataProvider="{myDataProvider}" >
  <mx:itemRenderer>
    <fx:Component>
      <mx:CheckBox selectedField="IsSelected" change="outerDocument.myFunction(event);" />
    </fx:Component>
  </mx:itemRenderer>
</mx:List>

change="outerDocument.myFunction(event, someOtherValue);"