private IReadOnly CreatePickerReadOnlyObject(DropDownItemBindingDescriptor binding)
 => (IReadOnly)Activator.CreateInstance
 (
     typeof(PickerReadOnlyObject <>).MakeGenericType(GetModelFieldType(binding.Property)),
     binding.Property,
     binding.Title,
     binding.StringFormat,
     binding.DropDownTemplate,
     this.contextProvider
 );
 private void AddDropDowCell(DropDownItemBindingDescriptor binding)
 => Properties.Add(CreatePickerReadOnlyObject(binding));