Flex中如何在displayAsPassword为true控件TextInput密码显示时，鼠标移上去时显示内容

main.mxml

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Applicationxmlns:mx="http://www.adobe.com/2006/mxml"
3. layout="vertical"
4. verticalAlign="middle"
5. backgroundColor="white">
7. <mx:Script>
8. <![CDATA[
9. import mx.formatters.DateBase;
10. ]]>
11. </mx:Script>
13. <mx:Form>
14. <mx:FormItemlabel="Name:">
15. <mx:TextInputid="ccName"
16. text="JOHN DOE"/>
17. </mx:FormItem>
18. <mx:FormItemlabel="Number:">
19. <mx:TextInputid="ccNumber"
20. text="4111111111111111"
21. displayAsPassword="true"
22. toolTip="{ccNumber.text}"/>
23. </mx:FormItem>
24. <mx:FormItemlabel="Type:">
25. <mx:ComboBoxid="ccType"
26. dataProvider="[American Express,MasterCard,Visa]"/>
27. </mx:FormItem>
28. <mx:FormItemlabel="Expiration:" direction="horizontal">
29. <mx:ComboBoxid="ccExpMM"
30. initialize="ccExpMM.dataProvider = DateBase.monthNamesShort;"/>
31. <mx:ComboBoxid="ccExpYYYY"
32. dataProvider="[2008,2009,2010]"/>
33. </mx:FormItem>
34. </mx:Form>
36. </mx:Application>