Load webpage in Flex extension for InDesign

Question

Hi All,
I am implementing an extension for InDesign CS6 and CC using Flash Builder 4.6, Ext Builder 2.1.
The panel reads a text file which contains the url of a webpage and renders it in an HTML control.. It is working with most urls..
But sometimes it stops loading the page midway. I get the urls from my client.
Here is the code I am using,
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
  layout="absolute"
  creationComplete="livepreview_creationCompleteHandler(event)">
<mx:Script>
protected function livepreview_creationCompleteHandler(event:FlexEvent):void
  var livePreviewFile:File = File.desktopDirectory.resolvePath("LivePreviewUrl.txt");
  if(livePreviewFile.exists)
       var fileStream:FileStream = new FileStream();
       fileStream.open(livePreviewFile, FileMode.READ);
       var livePreviewUrl:String = fileStream.readUTFBytes(fileStream.bytesAvailable);
       if(livePreviewUrl != "")
            livepreview.location = livePreviewUrl;
  else
  //TODO
  //Get some error error html url from server and use its value for location
  //livepreview.location = some error/hard coded url from server.;
</mx:Script>
<mx:VBox height="100%" width="100%" verticalAlign="middle" horizontalAlign="center">
  <mx:HTML id="livepreview" x="0" y="0" width="100%" height="100%"/>
</mx:VBox>
Is it possibe that background scripts executing in the webpage might be getting blocked by Flex causing the improper load?
Any way to overcome this?

Answer 1

If some property isn't available in Extension Builder environment, I think there is less that we can do. Perhaps there is any other control that might help me achieve what I want.
Any ideas?