Children of panel containers are hidden while the containers resize

            

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    <!-- behaviors\PanelResize.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark">
    <s:layout>
        <s:HorizontalLayout />
    </s:layout>
    <fx:Declarations>
        <mx:Resize id="myResizeOne" heightTo="300" target="{panelOne}"
            hideChildrenTargets="{[panelOne]}" />
        <mx:Resize id="myResizeTwo" heightTo="300" target="{panelTwo}" />
    </fx:Declarations>
    <s:Button id="b1" label="Reset"
        click="panelOne.height=200;panelTwo.height=200;" />
    <mx:Panel id="panelOne" title="Panel 1" height="200"
        mouseDown="myResizeOne.end();myResizeOne.play();">
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
    </mx:Panel>
    <mx:Panel id="panelTwo" title="Panel 2" height="200"
        mouseDown="myResizeTwo.end();myResizeTwo.play();">
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
        <s:Button label="Click Me" />
    </mx:Panel>
</s:Application>

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Children of panel containers are hidden while the containers resize : Panel Children « Container « Flex

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