What you can do is declare a custom TypeDescriptionProvider for the Chart type, early before you select your object into the PropertyGrid:

...
TypeDescriptor.AddProvider(new ChartDescriptionProvider(), typeof(Chart));
...

And here is the custom provider (you'll need to implement the CreateInstance method):

public class ChartDescriptionProvider : TypeDescriptionProvider
{
    private static TypeDescriptionProvider _baseProvider = TypeDescriptor.GetProvider(typeof(Chart));

    public override object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args)
    {
        // TODO: implement this
        return new Chart(...);
    }

    public override IDictionary GetCache(object instance)
    {
        return _baseProvider.GetCache(instance);
    }

    public override ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance)
    {
        return _baseProvider.GetExtendedTypeDescriptor(instance);
    }

    public override string GetFullComponentName(object component)
    {
        return _baseProvider.GetFullComponentName(component);
    }

    public override Type GetReflectionType(Type objectType, object instance)
    {
        return _baseProvider.GetReflectionType(objectType, instance);
    }

    public override Type GetRuntimeType(Type reflectionType)
    {
        return _baseProvider.GetRuntimeType(reflectionType);
    }

    public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
    {
        return _baseProvider.GetTypeDescriptor(objectType, instance);
    }

    public override bool IsSupportedType(Type type)
    {
        return _baseProvider.IsSupportedType(type);
    }
}