from the thread I referenced:
Go to the pane's tab, and select Sort Inside Groups By and then select Custom. Add your SortID. Then select Preset and Save as something like "by SortID". You now have created a custom sort order that you can use elsewhere.
Now, in your pane column header, Edit and set the Sorting to "by SortID".
For the file list below, use Set rules for file display... and set up the sort order you want under Modify Results > Sort by.
The sort order doesn't change because you select something above in the pane. You'll need a new view for that, or add a Publisher pane column.