def start_container(self, cls, **kwargs):
        """Append a new container."""
        # Convert stylename strings to actual style elements.
        kwargs = self._replace_stylename(kwargs)
        # Create the container.
        container = cls(**kwargs)
        self._containers.append(container)
def start_container ( self , cls , ** kwargs ) : kwargs = self . _replace_stylename ( kwargs ) container = cls ( ** kwargs ) self . _containers . append ( container )
Append a new container.