blog.log2e.com

Tutorials on TweenLite or TweenMax often rely on the easing functions that come with the Flash CS3 IDE. These functions are contained in the package fl.motion.easing. All classes under the package name fl are specific to Flash CS3 and are not available in the free Flex 3 SDK. If you, for example, use FlashDevelop with the Flex 3 SDK you have to import your easing functions from the package mx.effects.easing. So any time you see an import statement like this

import fl.motion.easing.*;

you should be able to replace it with

import mx.effects.easing.*;

and get the same functionality.