Set the value of the errorString property to create an error tip

            
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" verticalGap="20">
    <mx:Script>
    import mx.controls.ToolTip;
    import mx.managers.ToolTipManager;
    private var errorTip:ToolTip;
    private var myError:String;
    private function validateEntry(type:String, event:Object):void {

       event.currentTarget.errorString = type;
    }
  </mx:Script>
    <mx:TextInput id="ssn" enter="validateEntry('ssn',event)"/>
    <mx:TextInput id="phone" enter="validateEntry('phone',event)"/>
</mx:Application>

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Set the value of the errorString property to create an error tip : Event « Event « Flex

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