Treeview - How do I change icon on the expand?

The way it is set up now is that the icon changes when the node is highlighted. I only want it to change if it is expanded and changed back if it isn't. (Open folder and Closed Folder) like in Explorer.

I don't have the same Icons for each Node so how do I set it up so it doesn't change every node just the ones I want... I only want the first Node to change to this Icon not the child of it. I want the child to change into something different if it is expanded.

this is how it is now.

TreeView1.Nodes.Add(, , "u", "Invoices", "FoldersClosed", "FoldersOpen")

When you do this

TreeView1.Nodes.Add(, , "u", "Invoices", "FoldersClosed", "FoldersOpen")

FoldersClosed is the image and FoldersOpen is the image when the node is selected.
If you want to change the image on Expand and/or Collapse you need to do

VB Code:

Private Sub MyTreeView_Expand(ByVal Node As MSComctlLib.Node)
    Node.Image = "my expanded image"
End Sub

And similar code for the collapsed image in the Collapse event. If you only want to do it for some nodes you'll need to determine what is in Node.Key or Node.Text.