'The computed command path.  This is used for the ``usage``
information on the help page.  It\'s automatically created by
combining the info names of the chain of contexts to the root.'

@property
def command_path(self):

    rv = ''
    if (self.info_name is not None):
        rv = self.info_name
    if (self.parent is not None):
        rv = ((self.parent.command_path + '    ') + rv)
    return rv.lstrip()
