I'm trying to program a form with a treeview.   I have just created a root
node in the control.  Now I have called a routine to create a child node. As
I create these nodes I want to keep track of their indices in a data
structure.  The code is roughly as follows:

(Assume the original root node is the selected node)

Dim tn As New TreeNode
tvAreas.SelectedNode.Nodes.Add(tn)
tvAreas.SelectedNode = tn

At this point I try to get the index of the selected node and it's always -1

I've tried both
i = tvAreas.SelectedNode.Index
and
i = tvAreas.Nodes.IndexOf(tvAreas.SelectedNode)

What's going on here?