ColorTransform and Button events

If I create a button class, and colorize an mc within the button using The ColorTransform and Transform classes - why do the button events undo the transformation?


var	__colorTrans:ColorTransform = new ColorTransform();
var	__Transform:Transform = new Transform(myClip);
var __colorTrans.rgb = 0xFFFFFF;
var	__Transform.colorTransform = __colorTrans;