Color object prototyping in AS 2

1

hi everybody-

previously, i’ve been using a MovieClip prototype to create and set a color object, like this:

MovieClip.prototype.setRGB=function(hex){
(new Color(this)).setRGB(hex); //creates color object + sets color
}

which makes it easy to change a MC’s color like this:

MC.setRGB(0x00ff00);

now i’m working in AS 2.0, which seems to discourage using prototyping and extending the MC class methods–so my question is, what is the best approach for doing this in AS 2? i’ve created a new class to handle it, but it seems clunky to have to call an instance rather than having a MC call an internal method…

the bottom line, is: is it ok to extend the MovieClip class in AS2, and if not, what’s the cleanest approach?

thanks in advance,
-David