Flex组件及容器

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?Flex 3 MX 组件及其 Flex 4 Spark 对应组件：

FLEX 3 类，没有直接的 FLEX 4 BETA 对应类mx.controls.Alertmx.controls.ColorPickermx.controls.DataGridmx.controls.DateChoosermx.controls.DateFieldmx.controls.Menumx.controls.MenuBarmx.controls.PopUpButtonmx.controls.PopUpMenuButtonmx.controls.ProgressBarmx.controls.RichTextEditormx.controls.Treemx.containers.Accordionmx.containers.DividedBoxmx.containers.Formmx.containers.Gridmx.containers.TabNavigatormx.containers.TitleWindowmx.containers.ViewStack

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详细见：http://www.adobe.com/cn/devnet/flex/articles/flex3and4_differences_04.html