[RESOLVED] how to search in a combobox

[hannibal smith]

I've a combobox to display names:

  Dim names As New List(Of String)

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        names.Add("John")
        names.Add("Paul")
        names.Add("Lea")
        names.Add("Jen")
        names.Add("Joan")
        names.Add("Alex")
        names.Add("Jonny")
        names.Add("Alexis")
        names.Add("Francis")
        cmbNames.DataSource = names
    End Sub

When user digit on the combobox I would to filter and show only the names that contains the string entered.
So in textchange event I tryed to use .Contains and .findString, but I not get the behavour expected:
if "is" digit, I would have Alexis and Francis as result, if "Jo" is entered it would get John, Jonny and Joan. Instead I still get only the result that start with the string searched.
Any advice?