default_sort_column - Default sort column

When displaying trees, tables or lists, one of the columns in the list may be defined for ordering the list. The column is referenced by column number beginning with 0 for the first column. In order to request the default order (database index), -1 has to be defined, When defining -1 and no database order is defined, the items are listed in unordered sequence.

hen the sort column selected refers to a database order in the index field of its data source, the reference index is used for ordering.