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  <mx:CategoryAxis id="ca"
         categoryField="@date" title="August 2007" labelFunction="categoryAxisLabelFun" />
</mx:horizontalAxis>
 
private function categoryAxisLabelFun( item : Object, prevValue : Object, axis : CategoryAxis, categoryItem : Object) : String {
      var temp : String = item as String;
      return temp;
}
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private function categoryAxisLabelFun( item : Object, prevValue : Object, axis : CategoryAxis, categoryItem : Object) : String {
      var temp : String = item as String;
      return  '<font size="20">' + temp + </font>';
}
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private function categoryAxisLabelFun( item : Object, prevValue : Object, axis : CategoryAxis, categoryItem : Object) : String {
      var temp : String = item as String;
      return  '<B>' + temp + </B>';
}
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private function categoryAxisLabelFun( item : Object, prevValue : Object, axis : CategoryAxis, categoryItem : Object) : String {
      var temp : String = item as String;
      return  '<U>' + temp + </U>';
}
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private function categoryAxisLabelFun( item :


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