If you're using script macro to hide Blizzard original Cast Bar, this is the addon for you. I read on several forums players have problem with hiding original cast bar because it has been reset after every reload or login.
This lightweight addon simply hide original cast bar like an in-game script.
/hcb - will show addon help
/hcb on - turns on the Blizzard CastBar
/hcb off - turns off the Blizzard CastBar (this is the default setting when you download the addon)