A.   A person is responsible for conduct which is an element of an offense under this Chapter if the conduct is either that of the person himself or that of another and he is legally accountable for such conduct.
   B.   A person is legally accountable for the conduct of another when:
      1.   Having a mental state described by the statute defining the offense, he causes another to perform the conduct, and the other person in fact or by reason of legal incapacity lacks such a mental state.
      2.   The section defining the offense makes him so accountable.
      3.   Either before or during the commission of an offense, and with the intent to promote or facilitate such commission, he solicits, aids, abets, agrees or attempts to aid, such other person in the planning or commission of the offense. (Ord. 79-30, 12-17-1979)