I don’t kown if you have met the problem in flex project of the mouse control. For example like the right-mouse function(@see Replace the Flex’s Default Right Click Menu) and so on. When the list has fixed width and height and the context is too many to display. Then what you need to do? Of course you need an AutoScrollManager. Now you don’t need to write it by yourself. Someone has finished this job. Following is the original text and URL.