ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
MovieClip.trackAsMenu Property
Flash 6
modifies the onRelease( ) handler requirements, enabling menu-style behavior
read/write
mc.trackAsMenu
Description
The Boolean trackAsMenu property modifies the conditions that cause mc's onRelease( ) event handler to execute. It normally is used to turn a group of buttons into a menu and applies only to movie clips that define at least one button event handler. For complete details, see Button.trackAsMenu.