C#下WPF主窗體中載入別的Windows窗體時報： 無法將 Owner 屬性設定為之前未顯示的 Window的錯誤，程式碼：

 public MainWindow()
        {
            InitializeComponent();
            sceenAnimationWin = new SceenAnimationWin();
            sceenAnimationWin.Owner = this;
            sceenAnimationWin.Show();            
        }

private void WindowRendered(object sender, EventArgs e)
        {
            sceenAnimationWin = new SceenAnimationWin();
            sceenAnimationWin.Owner = this;
            sceenAnimationWin.Show();
        }