Have you ever tried making rounded corners in Flash? In all likelihood, yes—you have. Have you noticed that rounded corners tend to get pixelated when the rounded figure is small? I have recently noticed that—oddly enough, I had never had an opportunity to create very small objects with rounded corners before.
So there I was, scratching on my head, and looking thoughtfully at my creation. Fortunately enough, after a while I found a solution to this problem. It's called "stroke hinting".
Below you can see two images of the same corner in Flash: the first one without stroke hinting, the other—with stroke hinting applied to it.
Even though I have been using Flash 8 a long, long time now, I have never really paid much attention to the little Stroke hinting.
What this option does is keep your lines on whole pixels, which helps your rounded corners look more "normal".
What if you're still on Flash MX ? Then, it is possible to achieve the same effect by simply positioning your lines on whole pixels. Manually. You know—by typing integers in the x and y coordinate fields in the Properties Window.
Hope this information helped :-)