以下以Group为例子讲述如何在Flex 4中填充背景颜色、图片：
1、图片填充方式：
<s:Group x="0" y="0" height="100%" width="100%">
<s:Rect x="0" y="0" height="100%" width="100%">
<s:fill>
<s:BitmapFill source="@Embed('../imges/myBg.jpg')"/>
</s:fill>
</s:Rect>
</s:Group>
2、渐变色填充方式：
<s:Rect alpha="0.5" x="0" y="0" width="100%" height="100%">
<s:fill>
<s:LinearGradient rotation="250">
<s:GradientEntry color="0x222222" ratio="0"/>
<s:GradientEntry color="0xdddddd" ratio="1"/>
</s:LinearGradient>
</s:fill>
</s:Rect>
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