How to disable AutoComplete in SfComboBox?

<input:SfComboBox x:Name="sfComboBox"  Width="150"                                       DisplayMemberPath="Name" ComboBoxMode="Editable" Loaded="sfCombo_Loaded"/>

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject

{

   if (depObj != null)

   {

     for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)

     {

         DependencyObject child = VisualTreeHelper.GetChild(depObj, i);

         if (child != null && child is T)

         {

               yield return (T)child;

         }        

         foreach (T childOfChild in FindVisualChildren<T>(child))

         {

              yield return childOfChild;

          }

       }

    }

  }

  private void sfCombo_Loaded(object sender, RoutedEventArgs e)

  {

     SfTextBoxExt text = FindVisualChildren<SfTextBoxExt>( sfComboBox).First();

     if (text != null)

         text.AutoCompleteMode = AutoCompleteMode.None;

  }