Can the Attorney General rely on a "technical argument" on appeal?

^4. Buttinelli maintains the Attorney General is estopped from relying on this "technical argument" on appeal because the prosecutor did not raise it in the trial court. However, as the appellant, Buttinelli bears the burden of showing the trial court erred. (People v. Sanghera (2006) 139 Cal.App.4th 1567, 1573.) She has not done so. Indeed, to the contrary, the trial court would have erred had it allowed Buttinelli to belatedly exercise a peremptory challenge. (Cottle, supra, 39 Cal.4th at p. 258.)