HC was very helpful to show me how to update 1 clickers such as joomla and wordpress, but it requires manual work. So until the next HC build is released, users have to manually update the 1 clickers.
Id like to suggest a solution called SOFTACULOUS, used by other panels. Its really nice, as its ALWAYS updated with the latest version of all 1 clickers and gives an even wider range of options.
PS - by any chance, did anyone here try to update joomla via upload package? For me it fails and the trace logs are huge. I have to do it either via FTP/URL or an option in Joomla where it connects and updates itself automatically, which is fine and even easier.