var
Rect: TRect;

with StringGrid do
begin

Canvas.Brush.Color := clred;
Rect := StringGrid.CellRect(5,10);
Canvas.FillRect(Rect);
Canvas.TextOut(Rect.Left+2, Rect.Top+2, Cells[5, 10]);

end;

procedure TFormAw.DBGridFaelligeVorgaengeDrawColumnCell(Sender: TObject;
  const Rect: TRect; DataCol: Integer; Column: TColumn;
  State: TGridDrawState);
var ErledigtFlag:Boolean;
begin
  if (Sender is TDBGrid) then with (Sender as TDBGrid) do begin
    ErledigtFlag:=False;
    if Assigned(Column.Field) then begin
      if (Column.Field.DataSet.FindField('Erledigt')<>nil) then begin
        ErledigtFlag:=(Column.Field.DataSet.FieldByName('Erledigt').AsBoolean);
      end;
    end;
    if (ErledigtFlag) then begin
      Canvas.Brush.Color:=clSilver;//$00B3B3FF;//clYellow;
      Canvas.Pen.Color:=clBlack;//clRed;
      DefaultDrawColumnCell(Rect,DataCol,Column,State);
    end
    else
    if ((Column.Title.Caption='Termin') or (Column.Title.Caption='AbgelaufenAm')) then begin
      if Assigned(Column.Field) then begin
        if (Column.Field is TDateField) then begin
          if ((Column.Field.AsDateTime>0) and (Column.Field.AsDateTime<Date)) then begin
// if ((Fields.FindField('Status')<>nil) and (Column.FieldByName('Status...').AsString<>'...ok')) then begin
              Canvas.Brush.Color:=$00B3B3FF;//clYellow;
              Canvas.Pen.Color:=clRed;
              DefaultDrawColumnCell(Rect,DataCol,Column,State);
// end;
          end;
        end;
      end;
    end;
  end;
end;