MFC Newbie design question

Hi All,

I'm putting together an MFC app (SDI) that allows the
loading/editing/saving of an XML document.

The MSXML document will be stored as a reference in the Document
class.

The loaded (XML) document will be displayed in a TreeView.

To ease editing I was thinking about using SetItemData() to map a node
in the TreeView against its corresponding node in the XML document (by
storing a reference to the XML node against the TreeView node).

The user can then manipulate the DOM by selecting a node in the
treeview, changing it's attributes etc.

I have a slight chicken/egg problem though.

In Document::Serialize() I need to release the existing MSXML document
and clear down the existing treeview BEFORE loading a new document.

But I can't ->Release() the old MSXML document because its referenced
by nodes in the old tree.

So I think i have to firstly, delete all the items in the treeview, by
iterating though each item, calling GetItemData(), casting it back to
a smart pointer, calling release on the MSXML Node (smart pointer).
Then call DeleteAllItems() on the TreeCtrl, then release the MSXML
document.

I think I need to do this in Document::Seriliaze() prior to loading
the new document.

Does this sound right?

Many thanks in advance,
Ben.
.