This got me thinking on the topic of custom UI elements. The problem with those elements is that the programmer ends up rewriting the component, hoping that every little detail matches. I'm not sure about JS, but in some other languages you can make a new element inherit from the UI element class, and then modify its graphics - which effectively solves this problem. With all its flaws, if I recall correctly Flash let you do this - is there a way to do the same thing with JS?