Hi everyone. I found out how to freeze the colorbar as well. Actually, I got my answer from the test_main.m file of this submission. You should download cbfreeze.m and cbhandle.m (by Carlos Adrian Vargas Aguilera) and freeze your colorbar with these functions. Just make sure to download cbhandle.m as well or MATLAB will give you some handle errors.
Georgia: As I stated to Bui Yuki below, the rescale function comes in the zip file of this submission, in the subdirectory called "private". You need to put the folder containing the files on your MATLAB path or else cd to that directory (as with any function).