I'm trying to have two columns sorted when the grid is loading: Rank, and Date.  I would like it to be sorted first by rank and then by date.  How can I configure this on igGrid?  Right now it sorts by whatever column is in the grid first but I would like the Date column to be to the left but to sort by the Rank column first.  What I'm doing right now is

                features.
                    Sorting().
                    Mode(SortingMode.Multiple)
                    .ColumnSettings(settings =>
                    {
                        settings.ColumnSetting().ColumnKey("Rank").CurrentSortDirection("descending");
                        settings.ColumnSetting().ColumnKey("Date").CurrentSortDirection("descending");
                        });