'If Â«entryÂ» is registered into the pool, remove it.
Returns True if the entry was successfully registered, else False.
NOTE: This method triggers pool discovery.'

def unregister(self, entry):

    assert isinstance(entry, Wizard), u'entry    must    be    an    instance    of    Wizard'
    if self.is_registered(entry, passive=True):
        del self._entries[entry.id]
        return True
    return False
