Let's face facts, folks: sometimes just scaling your entire Flash movie to an arbitrary window size won't cut it. A prime example of one of those times would be if you're using Flash to create Web-based applications, where your users would rightfully expect to have the application interface scale intelligently to the size of their browser window. Flex Builder can do this through a simple GUI panel, but the process is a little more involved if you're using Flash CS4 Professional, which is where we'll pick things up.