What is the test for assessing liability for aiding and abetting a crime?

California courts have held that in order to impose liability on a defendant for aiding and abetting a crime, "the defendant's intent to encourage or facilitate the actions of the perpetrator 'must be formed prior to or during "commission" of that offense.'" People v. Joiner, 84 Cal. App. 4th 946, 967 (2000) (quoting People v. Montoya, 7 Cal. 4th 1027, 1039 (1994) (emphasis in original)). "[F]or the purpose of assessing the liability of an aider and abettor, a burglary is considered ongoing during the time the

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