Visual Studio natvis displaying pointer-to-interface

I'm trying to create debug visualizers for our company custom smart pointers. I would like to use ExpandItem to get the contents just one level down, which works for concrete types like ref_ptr<Vector2d>, but not for virtual types like ref_ptr<IStreamManager>. When using the virtual types, I get two entries, one for the underlying type, which I can then expand, and one for the __vfptr.

What I'm getting:

v streamManagerPtr         shared_ptr { count=35, ptr=... }
    [Reference Count]      2
  v [StreamMgr]            {...}
      m_resourceMgr        shared_ptr { count=35, ptr=... }
      m_fileMgr            shared_ptr { count=23, ptr=... }
      ...
  > __vfptr                0xdeadbeef
  > [Raw View]             {...}

What I want:

v streamManagerPtr         shared_ptr { count=35, ptr=... }
    [Reference Count]      2
    m_resourceMgr          shared_ptr { count=35, ptr=... }
    m_fileMgr              shared_ptr { count=23, ptr=... }
    ...
  > [Raw View]             {...}

Is there any way to bring the contents of the underlying dynamic type up one more level so I don't have to deal with this useless level of nesting?

I believe you can use something like this:

<Type Name="shared_ptr&lt;*&gt;">
  <Expand>
    <ExpandedItem Condition="ptr != 0">*ptr</ExpandedItem>
  </Expand>
</Type>

The ExpandedItem tag basically removes a level of nesting, displaying the contents of the item in the tag as though they were regular items at the same nesting level as the rest of the Items in the Expand tag.