I don't really understand what you mean... There's a group and order clause already defined in this code, you should use the "sort by" option in the views UI. Of course this only works when there are products sold in the store.
What exactly did you try to do with it? If it's something different, I'll try to include it... I'm also updating our concept store to beta3 at this point, so I still need to verify if this code keeps working...
(I've been busy on some other projects the past weeks, but for the next 3-4 weeks, I'm busy on ubercart stuff for a few days a week, so it's a good time to ask )