How to communicate between App loaded by SWFLoader

SWFLoader can load a full application inside another. How do you get access its public properties and methods? 

Here is an example for doing this…..

/** SWFLoaded.mxml */
<?xml version=”1.0″?>
<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml“
    backgroundColor=”yellow”>
<mx:Script><![CDATA[
  [Bindable]public var varOne:String = “This is a public variable”;

  public function setVarOne(newText:String):void {
      varOne=newText;
  }//setVarOne
]]></mx:Script>
  <mx:Label id=”lblOne” text=”I am here”/>
  <mx:Label text=”{varOne}”/>
  <mx:Button label=”Nested Button”
      click=”setVarOne(‘Nested button pressed.’);”/>
</mx:Application>

/** SWFLoaderTest.mxml */
<?xml version=”1.0″?>
<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml“>

<mx:Script><![CDATA[
  import mx.events.FlexEvent;
  import mx.controls.Alert;
  import mx.managers.SystemManager;
  import mx.controls.Label;
  import mx.core.Application;
 
  [Bindable]public var _appLoaded:Application;
 
  /** run by SWFLoader.complete event */
  private function onCompleteAppLoader(oEvent:Event):void
  {
    var smAppLoaded:SystemManager = SystemManager(oEvent.target.content);  //get a ref to the loaded app
    //listen for the application.complete event
    smAppLoaded.addEventListener(FlexEvent.APPLICATION_COMPLETE, onCurrentApplicationComplete);
  }//onCompleteAppLoader
 
  /** run by application.complete event */
  private function onCurrentApplicationComplete(oEvent:Event):void
  {
    _appLoaded = Application(oEvent.target.application);
    var sUrl:String = _appLoaded.url;
    SWFLoaded(_appLoaded).setVarOne(“This value set from main app!”); //without cast, strict check compiler complains
    lbl.text = “This value from loaded app:” + _appLoaded.url;
  }//onCurrentApplicationComplete 
 
         
  /** Update the Label control in the outer application
   * from the Label control in the loaded application. */
  public function updateLabel():void {
      lbl.text=_appLoaded["lblOne"].text;
  }//updateLabel
 
  /** Write to the Label control in the loaded application.*/
  public function updateNestedLabels():void {
      _appLoaded["lblOne"].text = “I was just updated”;
      _appLoaded["varOne"] = “I was just updated”;
  }//updateNestedLabels
 
  /** Write to the varOne variable in the loaded application
  * using the setVarOne() method of the loaded application.*/
  public function updateNestedVarOne():void {
      SWFLoaded(_appLoaded).setVarOne(“Updated varOne!”);
  }//updateNestedVarOne
]]></mx:Script>

  <mx:Label id=”lbl”/>
  <mx:SWFLoader id=”myLoader” width=”300″
      complete=”onCompleteAppLoader(event);”/>
 
  <mx:Button label=”Load SWF”
      click=”myLoader.source=’SWFLoaded.swf’;”/>   
  <mx:Button label=”Update Label Control in Outer Application”
      click=”updateLabel();”/>
 
  <mx:Button label=”Update Nested Controls” click=”updateNestedLabels();”/>
 
  <mx:Button label=”Update Nested varOne” click=”updateNestedVarOne();”/>
</mx:Application>