How can I do inverse selection in AdvStringGrid?
PROCEDURE InvertSelection(Grid : TAdvStringGrid);
  VAR
    C,R : Cardinal;

  BEGIN
    IF Grid.MouseActions.DisjunctCellSelect THEN
      FOR R:=Grid.FixedRows TO PRED(Grid.RowCount) DO FOR C:=Grid.FixedCols TO PRED(Grid.ColCount) DO Grid.SelectedCells[C,R]:=NOT Grid.SelectedCells[C,R]
    ELSE IF Grid.MouseActions.DisjunctRowSelect THEN
      FOR R:=Grid.FixedRows TO PRED(Grid.RowCount) DO Grid.RowSelect[R]:=NOT Grid.RowSelect[R]
    ELSE IF Grid.MouseActions.DisjunctColSelect THEN
      FOR C:=Grid.FixedCols TO PRED(Grid.ColCount) DO Grid.ColSelect[C]:=NOT Grid.ColSelect[C]
  END;