Gradient from script

Hi guys
I want to change the color of my movieClip from stage in a gradient color from script.The only thing that i could fiind is this that draw a MC and begin a gradient fill, but my mc is allready created and is on stage.

Any ideas how to do this..

Thank You

Hi,

Maybe this demo will help..

http://ntdesigns.net/demoFiles/colorMatrix.swf

The shape is done from script like in the example i give

code:

---

                          lineto(0, 800);

		lineto(800, 800);

		lineto(800, 0);

		lineto(800, -300);

		endFill();

	}

---

i need to aplay the gradient on my movieClip that is allready on stage.
Thanks for replay