Flash drawing tools - generally a bit crap. But if you know a few tricks you can get the job done. Take a look at the black lines around the shapes in the image below: (if you can't tell the difference between the two, this post is not for you ;)

What we're trying to do is draw a 100px x 100px shape with a single pixel line border. The problem is that if we grab the rectangle primitive tool and do that (making sure we keep the shape on an even pixel value, in this case x:55, y:40) we get the result on the left. The border is distorted and looks terrible.

The trick to getting the border looking nice as it does on the right is to set the shape to coordinates that are +0.5px for both x and y, and then reduce the size of the shape by one pixel.

So the green shape is set to x: 205.5, y: 40.5 and is actually set to be 99px x 99px in Flash. When we publish, the shape has a nice smooth border, and actually displays in the SWF as 100px x 100px in size.

Yep, it's a hack. In Flash. Surprise!