Toggling hidden files on the FileSystemTree control in Adobe AIR

<?xml version="1.0" encoding="utf-8"?>
<!-- http://airexamples.com/2008/12/15/toggling-hidden-files-on-the-filesystemtree-control-in-adobe-air/ -->
<mx:WindowedApplication name="FileSystemTree_showHidden_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle">
 
    <mx:ApplicationControlBar dock="true">
        <mx:CheckBox id="checkBox"
                label="showHidden:"
                labelPlacement="left" />
    </mx:ApplicationControlBar>
 
    <mx:FileSystemTree id="tree"
             showHidden="{checkBox.selected}"
             width="100%"
             height="100%" />
 
</mx:WindowedApplication>