Delphi 中 動態建立的Panel沒法改變顏色的解決辦法

剛開始代碼以下：

procedure TForm1.Button1Click(Sender: TObject);
var
  Panel: TPanel;
begin
  Panel := TPanel.Create(Form1);
  Panel.Name := 'pnlPreVideo';
  Panel.Parent := Form1;
  Panel.OnClick := Panel1Click;
  MoveWindow(Panel.Handle, 10, 10, 100, 100, True);
end;

procedure TForm1.Panel1Click(Sender: TObject);
begin
  if  (Sender as TPanel).Name ='pnlPreVideo' then
    (Sender as TPanel).Color := clGreen;
end;

單擊時，顏色不變，問網友，原來是一個BUG，更正後代碼以下：

procedure TForm1.Button1Click(Sender: TObject);
var
  Panel: TPanel;
begin
  Panel := TPanel.Create(Form1);
  Panel.Name := 'pnlPreVideo';
  Panel.ParentBackground := False;
  Panel.Parent := Form1;
  Panel.OnClick := Panel1Click;
  MoveWindow(Panel.Handle, 10, 10, 100, 100, True);
end;

procedure TForm1.Panel1Click(Sender: TObject);
begin
  if  (Sender as TPanel).Name ='pnlPreVideo' then
    (Sender as TPanel).Color := clGreen;
end;