A multiplexing UI used to combine FileChooserUIs.
Invokes the ensureFileIsVisible method on each UI handled by this object.
Invokes the getAcceptAllFileFilter method on each UI handled by this object.
Invokes the getApproveButtonText method on each UI handled by this object.
Invokes the getDialogTitle method on each UI handled by this object.
Invokes the getFileView method on each UI handled by this object.
Invokes the rescanCurrentDirectory method on each UI handled by this object.