Deleting roles

[Baeriswyl Kuno - Extern (IT-BA-MV)]

Hello,

The Roles views shows me a list of all available role in my continuum 1.2.2 
installation. I also see a role for each group beeing created. Unfortunately, 
this roles don't disappear in the list after the group is deleted. Is there a 
way to delete roles?

Thanks

Kuno