Finding Selected Item with Treeview control

This may be an extremely stupid question but my VB skills are a bit rusty so here goes:

I have a treeview control and I want to add a child to a node when the user clicks a toolbar button. I will then add a node as a child to the selected item. I figured the SelectedItem method will work great, but how do I determine if any item is selected at all?

I know I'm gonna feel stupid when I figure this out.

to check if something is selected:

Code:

---

if treeview1.selecteditem is nothing then
    'nothing is selected
else
    'something is selected
endif

---

That did it, thanks