def METHOD_NAME(self):
    if not self.blink_channels:
        # Don't start blinking if there are no multiple images to blink
        # in this channel
        if len(self.channel) <= 1:
            self.fv.show_error(
                "Blink opened in local mode and there are not multiple "
                "images to blink in this channel")
            return
    self._set_interval_cb()