Code:

Function SetCaretPosition(memo:TMemo; x,y:integer);

{©Drkb v.3(2007): www.drkb.ru,

®Vit (Vitaly Nevzorov) - nevzorov@yahoo.com}

var i:integer;

begin

i := SendMessage(memo.Handle, EM_LINEINDEX, y, 0) + x;

SendMessage(memo1.Handle, EM_SETSEL, i, i);

end;

или

type TFake=class(TCustomMemo);

....

TFake(MyMemo).SetCaretPos()