Defines the slot triggered by Framework startup.

        :return: Method success.
        :rtype: bool

def on_startup(self):
        """
        Defines the slot triggered by Framework startup.

        :return: Method success.
        :rtype: bool
        """

        LOGGER.debug("> Calling '{0}' Component Framework 'on_startup' method.".format(self.__class__.__name__))

        self.refresh_nodes.emit()
        return True