Edit multi-dimensional object in PropertyGrid

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C#3.5

I'm sending the following CappedCall class to the propertygrid.

[TypeConverter(typeof(ExpandableObjectConverter))]
[DataContract(Name = "Junk", Namespace = "MFL")]
public class Junk
{
  public Junk() { }
  [DataMember] public double Goo { get; set; }
}
[DataContract(Name = "CappedCall", Namespace = "MFL")]
public class CappedCall : Call
{
  public CappedCall() { }
  [DataMember] public Junk Goo { get; set; }
  [DataMember] public double UpperStrike { get; set; }
}

I would like to edit the field Goo while in the CappedCall object. When I add the tag TypeConverter on the Junk class, Goo appears to be a modifiable attribute, when it really isn't. Is there any way while in a CappedCall object to modify Goo?