Set Accordion creationPolicy to all, which instructs the container to instantiate all controls for every panel in the navigator container when the application starts
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<!-- layoutperformance/AllCreationPolicy.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:Panel title="Accordion">
<mx:Accordion id="myAccordion" creationPolicy="all">
<mx:VBox label="Accordion Button for Panel 1">
<mx:Label text="Accordion container panel 1" />
<s:Button label="Click Me" />
</mx:VBox>
<mx:VBox label="Accordion Button for Panel 2">
<mx:Label text="Accordion container panel 2" />
<s:Button label="Click Me" />
</mx:VBox>
<mx:VBox label="Accordion Button for Panel 3">
<mx:Label text="Accordion container panel 3" />
<s:Button label="Click Me" />
</mx:VBox>
</mx:Accordion>
</s:Panel>
</s:Application>
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