Container components created in Adobe Flash CS3 Professional for use in Flex are subclasses of the mx.flash.ContainerMovieClip class.
You can use a subclass of ContainerMovieClip as a Flex container, it can hold children, and it can respond to events, define view states and transitions, and work with effects in the same way as can any Flex component.
A Flash container can only have a single Flex child. However, this child can be a Flex container which allows you to add additional children.
FlexContainerMovieClip is derived from the FlexUIMovieClip class. No classes derive from this class.
In addition to the methods it inherits from FlexUIMovieClip, FlexDisplayObject, and AnyWin, FlexContainerMovieClip has the following methods:
FlexContainerMovieClip inherits all its properties from FlexUIMovieClip, FlexDisplayObject, and AnyWin.