private void ApplicationThemeComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { if ((sender as ComboBox).SelectedItem == null) { Themes.ApplyWindowsTheme(); MainWindow.Instance.MainText = (string)Application.Current.FindResource("Options:CurrentThemeRemoved"); } else { Themes.ApplyTheme((sender as ComboBox).SelectedItem.ToString()); } }