Listbox Item "top" position

[dageek247]

How would i get it?
I am trying to to make it easier for my program users to edit the list items. I want it to work like this:

Private sub list1_dblclick()
text1.visible = true
text1.text = list1.list(list1.listindex)
'here is where i cannot figure out what to do(i know the below code wont work. i've tested it.)
text1.top = list1.listindex.top
end sub

how could i get it that every time the user double clicks on a list item, that a textbox apears there all they have to do is edit the text and press enter.
i mostly just need to get the "top" position of a selected list item.