Reflection Property Names using Generic Types

I am having trouble getting all of the correct values in my reflection method. It seems when I start to transverse through the models that the method just stops finding the IEnumerables to transverse when it gets to the ItemData class. (i.e. It will only iterate through ItemId and Active but will not recognize the IEnumerables as properties)

What I need it to do is get the names of the various IEnumerables throughout the type. For example, when the type is passed through the code, the following items will be added to a list: Content, Data, ItemAttributes, ItemUrls, and InventoryInformation.

The Models:

public class ModelBase<TModel>
{
    public string Error { get; set; }
    public IEnumerable<TModel> Content { get; set; }
}

public class ItemContent
{
    public IEnumerable<ItemData> Data { get; set; }
    public int Total { get; set; }
}

public class ItemData
{
    public long ItemId { get; set; }
    public bool Active { get; set; }
    IEnumerable<ItemAttribute> ItemAttributes { get; set; }
    IEnumerable<string> ItemUrls { get; set; }
    IEnumerable<InventoryInformation> InventoryInformation { get; set; }
}

public class ItemAttribute
{
    public string AttributeName { get; set; }
    public bool IsRequired { get; set; }
}

public class InventoryInformation
{
    public int AreaId { get; set; }
    public double Price { get; set; }
}

The Code:

// T is ModelBase<TModel> in this context...
// TModel is ItemContent in this context...
GetProperties(typeof(T));

private void GetProperties(Type classType)
{
    foreach (PropertyInfo property in classType.GetProperties(BindingFlags.Public | BindingFlags.Instance))
    {
        if (property.PropertyType.IsGenericType && (property.PropertyType.GetGenericTypeDefinition() == typeof(IEnumerable<>)))
        {
            ValuesToList.Add(property.Name);

            foreach (Type nestedType in property.PropertyType.GetGenericArguments())
            {
                GetProperties(nestedType);
            }
        }
    }
}

private List<string> ValuesToList { get; set; }

I believe I have got it close but another pair of eyes would be appreciated.