Since early in its life, Flash has proven itself the leader in web animation. In recent years, that dominance has nudged into the realm of online applications as well. For user-facing applications, you need user interface (UI) elements, plain and simple—something to receive input from the person viewing your content or display information in a specific way, such as in a grid or selection box. Sure, you've already seen how button symbols work, and you're aware that input text fields accept hand-typed content. Those make a good start, but they're also nothing more than the tip of the iceberg.

The UI components that ship with Flash CS4 are an improvement over the previous set, which shipped with ...

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