Just click on the program's name once you open it and change it.
I know it is not clear at all because the user interface doesn't make it obvious that you can edit the name, but you'd be surprise how many things I have found by just clicking around.
It would be good if next to the name there was a little icon to indicate editing the name is possible like a little pencil graphic. Right clicking on the name on the left side tree should include the option to re-name as well but it hasn't happened yet.
I was viewing by Calendar and not summary - which doesn't give me that option. Thanks so much - this saves so much time in the reorg project I am about to do.