autocomplete text box in wpf

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VB

Windows

WPF

Hi all

Please help me in doing a auto complete text box in wpf using VB.NET. i got the below code but getting error..

Dim col As New AutoCompleteStringCollection
       Dim i As Integer
       For i = 0 To ds.Tables(0).Rows.Count - 1
           col.Add(ds.Tables(0).Rows(i)("columnname").ToString())
       Next
       txtCompanyName.AutoCompleteSource = AutoCompleteSource.CustomSource
      txtCompanyName.AutoCompleteCustomSource = col
      txtCompanyName.AutoCompleteMode = AutoCompleteMode.Suggest

i m getting error at the underlined places
"AutoCompleteSource is not a member of system.windows.controls.textbox"

Thank you