Как закрасить одну клетку в stringgrid в delphi?

переделай из этого :

procedure TFormHistory.ListHistoryDrawCell(Sender: TObject; Col, Row: Integer;
Rect: TRect; State: TGridDrawState);
var
S: string;
DrawRect: TRect;
CurrentColor: TColor;
begin
// Определяем цвет строки в зависимости типа Imcoming
if (Sender as TStrinGgrid).Cells[COLUMN_INCOMING, Row ] = '1' then
CurrentColor:=clBlue
else
CurrentColor:=clMaroon;

if (Sender as TStrinGgrid).Row = Row then
CurrentColor := clHighlightText;

(Sender as TStrinGgrid).Canvas.font.color := CurrentColor;
S:= (Sender as TStrinGgrid).Cells[ Col, Row ];
if (Col = COLUMN_MESSAGE ) and (Row <> ROW_HEADER) then
begin
if Length(S) > 0 then
begin
DrawRect:=Rect;
DrawText((Sender as TStrinGgrid).Canvas.Handle, Pchar(S), Length(S),
DrawRect, dt_calcrect or dt_wordbreak or dt_left );
if (DrawRect.bottom - DrawRect.top) > (Sender as TStrinGgrid).RowHeights[Row] then
(Sender as TStrinGgrid).RowHeights[row] :=(DrawRect.bottom - DrawRect.top)
else
begin
DrawRect.Right:=Rect.Right;
(Sender as TStrinGgrid).Canvas.FillRect( DrawRect );
DrawText((Sender as TStrinGgrid).Canvas.Handle, Pchar(S),
Length(S), DrawRect, dt_wordbreak or dt_left);
end;
end;
end
else
if Row <> ROW_HEADER then
(Sender as TStrinGgrid).Canvas.Textout(rect.left+3, rect.top+3, S );
end;