AutoCAD .NET :: Sheet Set Custom Property Field TransmittalSetups?

The SheetSetObject has an inbuilt custom property called "TransmittalSetups", but the property has a different internal object structure compared to other CustomProperty 

Ie: 

[code]

Dim myPropEnum As IAcSmEnumProperty = myCPB.GetPropertyEnumerator
Dim myPropName As String = Nothing
Dim myPropValue As AcSmCustomPropertyValue = Nothing


myPropEnum.Next(myPropName, myPropValue)

[/code]

myPropName is a string, and in this instance it returns a value of "TransmittalSetups"

myPropValue.GetValue is a string, and it says "System.__ComObject" not a "value".

So my question is, how do identify this object, how to interigate it or assign it to its native object type.

I have tried to cast it to different IAcSmEnum types but without success.