AutoSuggestion in a WPF combobox

My combobox returns a set of values from s stored procedure as this

  private void BindCombo()
         {
             DataCombo.FillCombo(ComboDS(2313001), cmbClass, 0);
             DataCombo.FillCombo(DDCombo(5007), cmbGroup, 0);
 
 
         }
 

I managed to give a rudimentary auto complete suggestion as IsTextSearchenabled but cannot get a auto suggestion box that i would like.

I have seen loads of examples of autocomplete/suggestive textboxes but none of them seem to suit me.

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