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  4. Cast current target to a TextInput class

    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark" width="500">
    
         
        import mx.core.UIComponent; 
        private function tiHandler(e:Event):void { 
        
            TextInput(e.currentTarget).selectRange(0,3); 
        } 
      
    
            text="When you click on this control, the first three characters are selected."
        width="400" />