This property specifies the column used for initial sorting. Each grid column is identified by a sequential index, starting with 0 for the first column, 1 for the second column, and so on. If the property is omitted or set to blanks, sorting is not initiated when the grid is first rendered.
Possible Values: Any valid column number
When "initial sort column" is bound to a character field and is a comma-separated list, then the grid indicates that each column in the list is sorted; in which case, Default Sort Order determines the sort direction indicated.
Multi-sort is available with Profound UI Version 6 Fix Packs after 2.1. ("initial sort column" cannot be bound to character fields until after Fix Pack 2.1)