Highlighting a default treeview node

[C# Programming]

How do you highlight a treeview node at startup?

I have the node needed from BuildNodeTree() as defaultNode, and the following in frmMain_Load

private void frmMain_Load(object sender, EventArgs e)
{
BuildNodeTree();
treeview.SelectedNode = defaultNode;
}
This doesn't highlight the node. I'm assuming because it hasn't displayed yet.

What are my options?

Thank you.