private bool CustomerFilter(object item)
 {
     //IGroup customer = item as IGroup;
     if (!string.IsNullOrEmpty(_filterString) && SearchProperties != null && SearchProperties.Any())
     {
         return(SearchProperties.Any(x => (item.GetType().GetProperty(x).GetValue(item)?.ToString().ToLower() ?? string.Empty).Contains(_filterString.ToLower())));
     }
     return(true);
 }