Expand everything but one

Hi !

I want to expand all of my properties but one. I tried this DataFactory code according to your sample but it doesn't work :

protected override IPropertyModel CreatePropertyModel(object target, PropertyDescriptor propertyDescriptor, IDataFactoryRequest request)
{
 var propertyModel = base.CreatePropertyModel(target, propertyDescriptor, request);
 propertyModel.IsExpanded = propertyDescriptor.PropertyType.Name != "PropertyPatcher";
 return propertyModel;
}

 It correctly set isExpanded to true for everything but "PropertyPatcher", I checked in debug mode, but nothing is expanded anyway.

I also tried to set the ArePropertiesAutoExpanded to true in addition with that code but everything is correclty expanded even the one I don't want.

Any idea how I can achieve this ?