People v. Voit, ___Cal.App.4th ___, ___ Cal.Rptr.2d ___, 2011 WL 5607628 (6th Dist. Nov. 18, 2011) (defendant is estopped from trying to set aside his plea, for lack of a factual basis, without trying to set aside the concession, where he conceded at plea there was a factual basis).