BorderContainer 设置背景透明
<s:BorderContainer?width="48"
?2???? height="41"
?3???? id="bc4"
?4???? borderVisible="false">
?5???? <s:layout>
?6???? <s:BasicLayout?clipAndEnableScrolling="true"/>
?7???? </s:layout>
?8???? <s:backgroundFill>
?9??????? <s:SolidColor?
10???????????? color="0xffffff"?
11???????????? alpha="0"/>
12???? </s:backgroundFill>
13??????? <s:BitmapImage?source="{d0}"
14????????????? width="48"
15????????????? height="83"
16????????????? top="-42"
17???????????? id="img4"/>
18????? </s:BorderContainer>
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来源：http://www.cnblogs.com/dzone/archive/2011/09/22/2185118.html
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就这段代码就可以解决 了： 其它换汤不换药，还是将背景透明度设成 0！！
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<s:backgroundFill>