Trier un TStringgrid

procedure SortStringGrid( var GenStrGrid: TStringGrid; ThatCol: integer);
const
TheSeparator = '@';
var
CountItem, I, J, K, ThePosition: integer;
MyList: TStringList;
MyString, TempString: string;
begin
CountItem := GenStrGrid.RowCount;
MyList := TStringList.Create;
MyList.Sorted := False;
try
begin
for I := 1 to (CountItem - 1) do
MyList.Add(GenStrGrid.Rows[I].Strings[ThatCol] + TheSeparator +
GenStrGrid.Rows[I].Text);
Mylist.Sort;

for K := 1 to Mylist.Count do
begin
MyString := MyList.Strings[(K - 1)];
ThePosition := Pos(TheSeparator, MyString);
TempString := '';
{Eliminate the Text of the column on which we have sorted the StringGrid}
TempString := Copy(MyString, (ThePosition + 1), Length(MyString));
MyList.Strings[(K - 1)] := '';
MyList.Strings[(K - 1)] := TempString;
end;

for J := 1 to (CountItem - 1) do
GenStrGrid.Rows[J].Text := MyList.Strings[(J - 1)];
end;
finally
MyList.Free;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
//trier le Stringgrid d'après la première colonne
SortStringGrid(StringGrid1, 1);
end;