Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
  System.EventArgs) Handles MyBase.Load
        ComboBox1.AutoCompleteMode = AutoCompleteMode.Append
        ComboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource
        ComboBox1.AutoCompleteCustomSource.Add("Stefan")
        ComboBox1.AutoCompleteCustomSource.Add("Joachimsthaler")
End Sub