I have an excel vba macro that uses a collection to store some string
data. The collection 'key' is a string that is shown in a listbox. (as
below)

When accessing the 'Item' property, I get the runtime error: "Object
variable or With block variable not set"

' lbFiles is a listbox
Dim FileNames_ As Collection
Private Sub btn_Click()
Dim ListItem As Integer
ListItem = GetSelected()

If ListItem -1 Then
Dim Path As String
Path = FileNames_.item( lbFiles.List(ListItem)) 'error here
'...
End If

'...
End Sub

I noticed that in all the documentation, the 'Item' property is upper
case, but if I try to type 'FileNames_.Item' in to vba, it
automatically lowers the case. (as above) Does that make a difference?

Thanks,
Paul