Flex Form validator 收集

<mx:NumberValidator id="validator" source="{combo}" property="selectedIndex" minValue="0" invalid="changeComboBorder(event)" valid="changeComboBorder(event)" />

private function changeComboBorder(event:ValidationResultEvent):void {
  var validator:Validator = event.target as Validator;
  var comboBox:ComboBox = validator.source as ComboBox;

  if (event.type == ValidationResultEvent.VALID) {
    comboBox.setStyle("borderColor", 0xB7BABC);
  }
  else {
    comboBox.setStyle("borderColor", 0xFF0000);
  }
}

<mx:NumberValidator id="comboValidator" required="true" minValue="0"
    	invalid="changeComboBorder(event)" valid="changeComboBorder(event)"
    	triggerEvent="focusOut"
    	source="{trialCombo}" property="selectedIndex" />