기본 속성에는 없더라...
procedure TForm1.FormCreate(Sender: TObject);
var
AStyle:Integer;
begin
AStyle:=GetWindowLong(edText.Handle,GWL_STYLE);
AStyle:=AStyle or ES_RIGHT;
SetWindowLong(edText.Handle,GWL_STYLE,AStyle);
edText.Repaint;
end;