Elastic menu tutorial?

I’m looking for a tutorial to create an “Elastic Menu” in AS3, something similar FlashBox’s “ElasticMenu” which is available to purchase through Flash Components - http://www.flashcomponents.net/component/elastic_flash_menu.html (but using image thumbnails, and on a transparent background).

I’d really like to learn how to create the effect myself, but have been unable to find a tutorial. If anyone knows of a good tutorial - either for this type of effect, or for understanding the principles behind it, please let me know!