flex4器皿、组件垂直和水平居中显示

flex4容器、组件垂直和水平居中显示?s:Panel horizontalCenter0 verticalCenter0 width400 heigh

flex4容器、组件垂直和水平居中显示

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<s:Panel horizontalCenter="0" verticalCenter="0" width="400" height="300"></s:Panel>

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?horizontalCenter="0"水平居中

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verticalCenter="0" 垂直居中