[Zope] Assigning Permissions To Roles

I am having trouble getting Roles to work via my Python Product. Creating a local role works fine: self._addRole('myRole') But how do I tell the Role what permissions it has programmatically? After looking in Role.py, I tried the following: self.manage_role('myRole', ['View management screens, View']) but this kicks up an error. Am I calling this impoperly? kh