9-Slice Scaling in Flash

One of the humbling things about working primarily in Photoshop, Illustrator and Flash is that I've been using these applications for years and I'm still stumbling across new features. My latest discovery is Flash 8's 9-slice scaling.
Down at the bottom of the advanced options of the Symbol Properties window is a checkbox labeled "Enable guides for 9-slice scaling." When enabled, a set of guides will be positioned in your symbol and when you scale an instant of this clip asymmetrically in your published SWF – it will maintain a crisp, clean appearance with undistorted corners and edges.

Life changing stuff right here.
Do you know how helpful that would have been on the Cox Group website?