concurring and dissenting.
For the reasons set forth in my dissenting opinion in Commonwealth v. Dowling, 482 Pa. 608, 611-612, 394 A.2d 488, 490 (1978) (Nix, J., dissenting), I disagree with the majority’s conclusion that appellant’s challenge to the validity of the guilty plea is waived due to his failure to petition the trial court for withdrawal of the plea.
Since the majority has determined that the question of ineffectiveness of counsel should be remanded for a hearing below (a decision in which I concur), I would also direct that court to consider the claim of invalidity of the guilty plea.