Changing text to an existing list box item

I have items in a list box control that I need to change the text of, but I haven't figured out how to do that yet.

If I could check the index of an existing item in the list box, I could then change the text of that index, but it doesn't appear that list box controls work that way.

Does anyone know how to change text for an existing item in a VB.NET List Box Control?

Thanks!
Bob

ListBox1.Items.Add("AA")
ListBox1.Items.Add("BB")
ListBox1.Items.Add("CC")
ListBox1.Items.Add("DD")
ListBox1.Items.Add("EE")


'in ur button click change "BB" to "VV"
ListBox1.Items.Item(1) = "VV"

Thanks!