[flexcoders] Unlike VBox, Spark Group Container shows child components even height=0

[ilikeflex]

Hi

Child components are displayed when height=0 for spark group container.So how 
can we hide the components in the Group.

This is used to work perfectly fine with VBox.

If you notice below the children of VBox are not displayed.

<?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>
        
        <s:Group width="100%" height="0">
                <s:Button label="Hi - group container"/>
        </s:Group>
        
        <mx:VBox height="0" width="100%">
                <s:Button label="Hi - mx VBOx container"/>
        </mx:VBox>
        
</s:Application>

So i want to hide the components in the group. 
Any pointer..

Thanks
Rajan