I found out why I couldn't use my custom white balance using photo in canon menu. The reason was that my wb wasn't in custom in ML menu. After changing the wb by hand there ain't no return to custom if you don't change one of the RGB's which can be found using "Q". Atleast I don't know another way. Custom works only when custom is on in the ML menu too Only thing was that it was hard to find how to change it to custom..