How would I get visible busy cursor while calling ImageSnapshot.captureImage?

Question

Hi,
I'm not sure if I understand correctly, but below is my very simple MXML file, where I try to show busy cursor before calling ImageSnapshot.captureImage. But instead my cursor dissapears atl all and then reappears after call is complete. Is it known functionality or should I use some callLater() call? Any help would be appreciated.
My code:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
<fx:Declarations>
  <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Script>
  <![CDATA[
   import mx.graphics.ImageSnapshot;
   import mx.graphics.codec.JPEGEncoder;
   import mx.managers.CursorManager;
   private function clickHandler() : void {
    CursorManager.setBusyCursor();
    const encoder:JPEGEncoder = new JPEGEncoder();
    var imageSnapshot:ImageSnapshot = ImageSnapshot.captureImage(mainContainer, 96, encoder, true);
    CursorManager.removeAllCursors();
  ]]>
</fx:Script>
<s:BorderContainer id="mainContainer" width="50%" height="50%">
  <s:Label x="40" y="44" text="My label" width="60" height="31"/>
  <s:Button x="30" y="79" label="Button" click="clickHandler()"/>
</s:BorderContainer>
</s:Application>

Answer 1

I'm experiencing the same problem. ¿Did you solve it?
It happens as if it were no background image defined for the bussy cursor.
But I have seen that such image is defined in default.css inside framework.swc, so it should work...