Flex TextArea auto height re-sizable component

Flex TextArea custom component which has auto height feature based on the content height.

It extends the TextArea component & updates the height based on the scroller content height.

package utils
{
   import spark.components.TextArea;
   public class TextAreaAutoHeight extends TextArea
   {
      public function TextAreaAutoHeight()
      {
          super();
      }

      override protected function updateDisplayList(unscaledWidth:Number,     unscaledHeight:Number):void
      {
          super.updateDisplayList( unscaledWidth, unscaledHeight );

          this.height = scroller.viewport.contentHeight + 2 ;

           if( this.height < minHeight )
               this.height = minHeight;

           if( this.height > maxHeight )
               this.height = maxHeight;
       }
    }
}


Screenshot: