Perspective Table sortOrder Property

I succeeded in specifying the sort order by adding elements in the “sortOrder” property array, and for each element’s value, I specified the “field” id for each column object – in order of sort priority (e.g. “0:t_stamp” for highest priority sorting on t_stamp column of the table, “1:Comments” for 2nd highest priority sorting on Comments column, etc.). The sort direction is selected using the “sort” object-member of each column object within the “columns” table property. The “sort” object-member provides a drop down menu to select between “none”, “ascending”, and “descending”.

This method worked in the designer preview mode, but for some reason, it is not working when I launch the perspective session. Any ideas why this may be?