hidden while the Panel containers resize
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Resize id="myResize" heightTo="300" hideChildrenTargets="{[panelOne, panelTwo]}" />
<mx:HBox>
<mx:Panel id="panelOne" mouseDownEffect="{myResize}">
<mx:Button />
</mx:Panel>
<mx:Panel id="panelTwo" mouseDownEffect="{myResize}">
<mx:Button />
</mx:Panel>
<mx:Panel id="panelThree" mouseDownEffect="{myResize}">
<mx:Button />
</mx:Panel>
</mx:HBox>
</mx:Application>
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