@classmethod
def add_source(cls, source):
    '\n        A convenience method for downstream modules to add channel\n        source types once they have implemented the step in the wizard\n        below.\n\n        This method must be called from `__setup__` method of downstream\n        module.\n        '
    source_leaf = cls.channel.domain[0][2]
    if (source not in source_leaf):
        source_leaf.append(source)
A convenience method for downstream modules to add channel
source types once they have implemented the step in the wizard
below.

This method must be called from `__setup__` method of downstream
module.
@classmethod
def add_source(cls, source):
    '\n        A convenience method for downstream modules to add channel\n        source types once they have implemented the step in the wizard\n        below.\n\n        This method must be called from `__setup__` method of downstream\n        module.\n        '
    source_leaf = cls.channel.domain[0][2]
    if (source not in source_leaf):
        source_leaf.append(source)