Class: TEgDBGridEx
property SortFields: TStrings;Controls which fields can be sorted by clicking their column title,
and in which direction(s). Each line is either a bare field name
(enables ascending sort only for that field) or a
FieldName=Directions pair, where Directions is
any combination of A (ascending) and D
(descending), case-insensitive - for example Name=AD allows
both directions on Name, while Name=D allows
descending only. A line using * as the field name applies
to any field not otherwise listed. An empty list (the default) means no
field can be sorted by clicking its title.
Only tracks and displays which field/direction is active - it does
not resort the dataset itself; do that in OnSortChange.