The mx.preloaders package contains the classes used by the download progress bar.

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	Interface	Description
	IPreloaderDisplay	The IPreloaderDisplay interface defines the inteface that a class must implement to be used as a download progress bar.

	Class	Description
	DownloadProgressBar	The DownloadProgressBar class displays download progress.
	Preloader	The Preloader class is used by the SystemManager to monitor the download and initialization status of a Flex application.