matlab - password program

It's my password program with locked property. It's okay, but first of all why Cancel button doesn't work? also there's a simple problem with this locked property: if you enter your password incorrectly three times, first of all 'Try again' will show and then 'LOCKED!'. you know this feature isn't interesting. I want to show ONLY one message that's LOCKED!

      if (strcmp(pass,password))
          uiwait(msgbox('Welcome!'));
          break;
      else
          uiwait(errordlg('Try again!'));
          wrong = wrong + 1;

          if (wrong == 3)
              lock = true;
              break;
          end
      end
  end

if (lock)
    uiwait(errordlg('LOCKED!'));
    return;
end

Answer 1

[Walter Roberson]

      else
          wrong = wrong + 1;

          if (wrong == 3)
              lock = true;
              break;
          else
            uiwait(errordlg('Try again!'));
          end