title: Issue with WPF custom control (Multi-Select Combobox)
body: <p>On code project I found the following:
  <a href="http://www.codeproject.com/KB/WPF/MultiComboBox.aspx" rel="nofollow">http://www.codeproject.com/KB/WPF/MultiComboBox.aspx</a></p>
  
  <p>I have integrated the following into a sample application and it seems to be working well.  The only issue I have right now is that if I type in the control I would like to be taken to the items that start with those letters the same way a normal combobox or listbox functions.</p>
  
  <p>I have tried adding <code>KeyboardNavigation.DirectionalNavigation="Contained"</code> and <code>TextSearch.TextPath="City"</code> as well as <code>IsTextSearchEnabled="True"</code>.</p>
  
  <p>None of these seem to be helping.  Any thoughts on how to implement text search functionality using this control?</p>