flex使用样式控制button的icon（图片）切换

1.定义button

<s:Button styleName="myButton2" width="92" height="29" />

2.设置样式

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.myButton2:up{icon:Embed("assets/pic/title/login-default.png");}.myButton2:over,.myButton2:down{icon:Embed("assets/pic/loginButtonTwo.png");}

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