Convert the graphic inside of the MovieClip to a MovieClip, name it for example _mc and then change the color of _mc. That would work.
mcr._mc.transform.colorTransform = CT;
The MovieClip does not seem to move even you eliminate the Tween completely and stays in frame 1. I am not sure the reason for that. Since the timeline moves it appears that the MovieClip is invisible and all you see is an image of the new Object at a certain position in all frames. You probably need to use AS and no frames to get a Tween.