Faire défiler un TRichEdit/ TMemo à une position définie

procedure TForm1.Button1Click(Sender: TObject);
begin
with RichEdit1 do
begin
// Move to the last line:
SelStart := Length(Text);
Perform(EM_SCROLLCARET, 0, 0);}

// Move to the first line:
selstart:=perform(EM_LineIndex,0,0)+0;
Perform(EM_ScrollCaret, 0 , 0);

// Move to Line 5, Character 3:
selstart:=perform(EM_LineIndex,5,0)+3;
perform(EM_ScrollCaret,0,0);

// Set the focus on the RichEdit:
SetFocus;
end;
end;