public static object GetItemsPerRow(IListingPageBase that) => that.Value("itemsPerRow");
 public static Umbraco.Core.PropertyEditors.ValueConverters.ColorPickerValueConverter.PickedColor GetBackgroundColor(IListingPageBase that) => that.Value <Umbraco.Core.PropertyEditors.ValueConverters.ColorPickerValueConverter.PickedColor>("backgroundColor");