核心提示：procedure TMainForm.AllDrawGridClick(Sender: TObject);var Rect: TRect;begin Rect:=TDrawGrid(Sender)....

procedure TMainForm.AllDrawGridClick(Sender: TObject);
var
  Rect: TRect;
begin

  Rect:=TDrawGrid(Sender).CellRect(TDrawGrid(Sender).Col,TDrawGrid(Sender).Row);
  TDrawGrid(Sender).Canvas.Pen.Color := clFuchsia;
  TDrawGrid(Sender).Canvas.Pen.Width:=2;

  TDrawGrid(Sender).Canvas.MoveTo(Rect.Left, Rect.Top);
  TDrawGrid(Sender).Canvas.LineTo(Rect.Right, Rect.Top);

  TDrawGrid(Sender).Canvas.MoveTo(Rect.Left, Rect.Top);
  TDrawGrid(Sender).Canvas.LineTo(Rect.Left, Rect.Bottom);

  TDrawGrid(Sender).Canvas.MoveTo(Rect.Right, Rect.Top);
  TDrawGrid(Sender).Canvas.LineTo(Rect.Right, Rect.Bottom);

  TDrawGrid(Sender).Canvas.MoveTo(Rect.Left, Rect.Bottom);
  TDrawGrid(Sender).Canvas.LineTo(Rect.Right, Rect.Bottom);
end;