def connect(self):
        d = Deferred()
        self.registerDeferred('connect', d)
        return d
Helper to only draw once for picking
dataset/ETHPy150Open couchbase/couchbase-python-client/txcouchbase/bucket.py/RawBucket.connect--crossover with--dataset/ETHPy150Open mne-tools/mne-python/mne/viz/evoked.py/_butterfly_on_button_press