Flex shake effect.

shake.mxml

<s:Panel id="ui">
  <!-- anything -->
</s:Panel>

</fx:Declarations>
  <s:Sequence id="shake" target="{ui}" duration="30">
    <s:Move xBy="20"/>            
    <s:Move xBy="-20"/>            
    <s:Move xBy="20"/>            
    <s:Move xBy="-20"/>            
    <s:Move xBy="20"/>            
    <s:Move xBy="-20"/>            
    <s:Move xBy="20"/>            
    <s:Move xBy="-20"/>            
  </s:Sequence>
</fx:Declarations>

<fx:Script>
  <![CDATA[
    protected function shakeFunction():void
    {
      shake.play();
    }
  ]]>
</fx:Script>