パスワード入力欄の指定方法

結構探しました(汗)
mx:TextInput の displayAsPassword属性(Boolean)ですね。

http://livedocs.adobe.com/flex/3_jp/langref/mx/controls/TextInput.html#displayAsPassword

ソース

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
  width                  = "100%"
  height                 = "100%"
  paddingLeft            = "0"
  paddingRight           = "0"
  paddingTop             = "0"
  paddingBottom          = "0"
  horizontalScrollPolicy = "off"
  verticalScrollPolicy   = "off"
  backgroundColor        = "#ffffff"
  layout                 = "absolute"
>

	<mx:Form width="100%" height="100%">
		<mx:FormItem label="パスワード" id="passwordItem" verticalGap="0" >
			<mx:TextInput width="100%" id="password" displayAsPassword="true" />
		</mx:FormItem>
	</mx:Form>
</mx:Application>

表示結果