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stringgrid1.Cells[x,0].color:=clred;					

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procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
begin
  if (ACol = 1) and (ARow = 1) then
  begin
    StringGrid1.Canvas.Font.Color := clRed;
    StringGrid1.Canvas.TextRect(Rect,Rect.Left+2,Rect.Top+2,StringGrid1.Cells[ACol,ARow]);
  end;
  inherited;
end;					

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procedure TForm1.StringGrid1MouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
VAR col, row : Integer;
begin
  StringGrid1.MouseToCell(x,y,col,row);
  StringGrid1.Cells[col,row]:='1';
end;					

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procedure einfaerben;
var i:integer;
begin
for i:=0 to 50 do
begin
form1.stringgrid1.canvas.brush.color:=clmaroon;
if (form1.stringgrid1.cells[i,1]='0') then
begin
form1.stringgrid1.canvas.brush.color:=clgreen;
form1.stringgrid1.canvas.FillRect(Rect(i*30,0,(i+1)*30),30);
end;
end;
end;					

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procedure TForm1.Timer1Timer(Sender: TObject);
var i,x,y:integer;
begin
x:=0;
y:=0;
for i:=0 to 50 do
begin
if (stringgrid1.Cells[x,0]='1') or (stringgrid1.cells[x+2,0]='1') then
begin
stringgrid1.cells[x+1,1]:='1';
end
else
begin
stringgrid1.cells[x+1,1]:='0';
end;
x:=x+1;
end;
for i:=0 to 50 do
begin
stringgrid1.cells[y,0]:=stringgrid1.cells[y,1];
y:=y+1;
end;
end;

einfaerben;

end;					

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procedure einfaerben;
var i:integer;
    myRect : TRect;
begin
  for i:=0 to 50 do
  begin
    form1.stringgrid1.canvas.brush.color:=clmaroon;
    if (form1.stringgrid1.cells[i,1]='0') then
    begin
      myRect.Left:=i*31;
      myRect.Top:=0;
      myRect.Bottom:=30;
      myRect.Right:=(i+1)*31;
      form1.stringgrid1.canvas.brush.color:=clgreen;
      form1.stringgrid1.canvas.FillRect(myRect);
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  einfaerben;
end;					

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var i:integer;
begin
i:=strtoint(eingabe.text);
shi.brush.color:=clred;
end;					

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procedure TForm1.Button1Click(Sender: TObject);
VAR i : INTEGER;
begin
  if Form1.FindComponent('sh'+edit1.text) is TShape
  then TShape(Form1.FindComponent('sh'+edit1.text)).brush.Color:=clRed;
end;					

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procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer; Rect: TRect; State: TGridDrawState);
begin
    if (StringGrid1.Cells[1, ARow] = 'AS') then begin
      with TStringGrid(Sender).Canvas do begin
           if (ACol = 3) and (ARow = 2) then begin
                Brush.Color:= clGray;
                FillRect(Rect);
            end;
        end;
    end;
end;					

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procedure TForm1.StringGrid1SetEditText(Sender: TObject; ACol, ARow: Integer; const Value: String);
begin
    if (StringGrid1.Cells[1, ARow] = 'AS') then begin
      StringGrid1.Cells[2, ARow] := 'Hallo Welt';
    end else if (StringGrid1.Cells[1, ARow] = 'Z') then begin
      StringGrid1.Cells[3, ARow] := 'Hallo Welt';
    end else if (StringGrid1.Cells[1, ARow] = 'AG') then begin
      StringGrid1.Cells[4, ARow] := 'Hallo Welt';
    end;
end;					

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type 
  Tgridhack=class(Tstringgrid);
...

procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
begin
  if (acol=3) and (Arow=2) then beep;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Tgridhack(StringGrid1).InvalidateCell(3,2);
end;