Can't mock XElement.Attribute.Value

Hi there.

I'm trying to mock a call like this:

Public Shared Sub PrintAttributeValue(ByVal node As XElement)
        Console.WriteLine(node.Attribute("Id").Value)
    End Sub

So basically I want the value of node.Attribute("Id").Value to be changed by mocking it. My first attempt to do this was:

<TestMethod()> _
Public Sub PrintAttributeValueTest()

        Dim fakeXElementNode As XElement = FakeInstance(Of XElement)(Members.ReturnRecursiveFakes)

        Using TheseCalls.WillReturn("123")
            Dim dummy As String = fakeXElementNode.Attribute("Id").Value
        End Using

        MyXElementClass.PrintAttributeValue(fakeXElementNode)

End Sub

But I get this error:

Test method Unit_Test.XElementTestTest.PrintAttributeValueTest threw exception: TypeMock.TypeMockException:
*** You are using TheseCalls.ReturnValue incorrectly - Method get_Value in type System.Xml.Linq.XAttribute returns System.Xml.Linq.XName and not System.String.
Please use TheseCalls.WillReturn(System.Xml.Linq.XName)..

Even though XElement.Attribute("Id").Value is a String, I'm getting the above exception mentioning an XName object. As an experiment, I change the unit test to this:

<TestMethod()> _
    Public Sub PrintAttributeValueTest()

        Dim fakeXElementNode As XElement = FakeInstance(Of XElement)(Members.ReturnRecursiveFakes)
        Dim fakeXName As XName = FakeInstance(Of XName)(Members.ReturnNulls)

        Using TheseCalls.WillReturn("TestName")
            Dim dummay As String = fakeXName.LocalName
        End Using

        Using TheseCalls.WillReturn(fakeXName)
            Dim dummy As String = fakeXElementNode.Attribute("Id").Value
        End Using

        MyXElementClass.PrintAttributeValue(fakeXElementNode)
    End Sub

This time, I go this error:

Test method Unit_Test.XElementTest.PrintAttributeValueTest threw exception: TypeMock.TypeMockException:
*** You are using TheseCalls.ReturnValue incorrectly - Method get_Value in type System.Xml.Linq.XAttribute returns System.String and not System.Xml.Linq.XName.
Please use TheseCalls.WillReturn(System.String)..

I'm a bit stuck on what to do, has anyone else managed to mock XElement.Attribute().Value?

Cheers.
Jas.