/// <summary>
        /// Show the selected theme.
        /// </summary>
        /// <param name="item">The selected theme.</param>
        private void ShowTheme(ThemeCatalogItem item)
        {
            AllControls demo = new AllControls();
            demo.Loaded += (obj, e) => System.Diagnostics.Debug.WriteLine("Loaded");
            demo.PreferredBackground = item.PreferredBackground;
            DemoControls.Children.Add(demo);

            Uri uri = new Uri(item.ThemeXamlPath, UriKind.Relative);
            demo.ApplyStyle(uri);
        }
        /// <summary>
        /// Show the selected theme.
        /// </summary>
        /// <param name="item">The selected theme.</param>
        private void ShowTheme(ThemeCatalogItem item)
        {
            AllControls demo = new AllControls();

            demo.Loaded += (obj, e) => System.Diagnostics.Debug.WriteLine("Loaded");
            demo.PreferredBackground = item.PreferredBackground;
            DemoControls.Children.Add(demo);

            Uri uri = new Uri(item.ThemeXamlPath, UriKind.Relative);

            demo.ApplyStyle(uri);
        }