Undocumented ActionScript 3

One of the things that I hung my hat on for a while in ActionScript 2 was this class for drawing boxes with corners of any radius. In ActionScript 3, they happen to have such a function built in but they don't like to talk about it. Apparently, it is used by some component in Flex but is not in any of their documentation. Doing searches might bring up some old beta syntax but this is the final:

displayObject.graphics.drawRoundRectComplex( x, y, width, height, tl-corner, tr-corner, br-corner, bl-corner );

Works great, and all in one line! I can't even begin to tell you how complicated my AS2 one was. Here is a full example:

var element:Sprite = new Sprite();
element.graphics.beginFill( 0xFF3300, 100 );
element.graphics.drawRoundRectComplex( 10, 10, 100, 100, 5, 10, 5, 0 );
element.graphics.endFill();
addChild(element);