改变tooltip的停留时间

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
        layout="vertical" 
        verticalAlign="middle" 
        backgroundColor="white"> 
  
    <mx:Script> 
        <![CDATA[ 
            import mx.managers.ToolTipManager; 
  
            // milliseconds (default 10000) 
            ToolTipManager.hideDelay = 2500; 
        ]]> 
    </mx:Script> 
  
    <mx:ApplicationControlBar dock="true"> 
        <mx:Label text="Mouse over the Button below to see the tool tip." /> 
    </mx:ApplicationControlBar> 
  
    <mx:Button id="button" label="click me" 
            toolTip="I'm a fabulous tool tip." /> 
  
    <mx:Label text="The tool tip will disappear after {(ToolTipManager.hideDelay/1000).toFixed(1)} seconds." /> 
  
</mx:Application>