/// <summary>
        /// Método que será executado quando o usuário clicar na opção Sobre no painel de settings.
        /// </summary>
        /// <param name="command"></param>
        void onSettingsCommand(IUICommand command)
        {
            UIElement controle = null;
            string    title    = string.Empty;

            if (command.Id.ToString() == "aboutSettings")
            {
                controle = new Sobre();
                title    = "Sobre";
            }

            if (controle != null)
            {
                Flyout f = new Flyout(
                    new SolidColorBrush(Colors.White),
                    new SolidColorBrush(Colors.Black),     //new SolidColorBrush(ColorHelper.FromArgb(255, 113, 177, 209)),
                    title,
                    FlyoutDimension.Medium,
                    controle);

                f.OnClosing += f_OnClosing;
                f.Show();
            }
        }