private static void OnAutoCompleteLabelsSource(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
// var tb = sender as TextBox;
// if (tb == null)
// return;
//
// //If we're being removed, remove the callbacks
// if (e.NewValue == null)
// {
// tb.TextChanged -= OnTextChanged;
// tb.KeyDown -= OnPreviewKeyDown;
// }
// else
// {
// //New source. Add the callbacks
// tb.TextChanged += OnTextChanged;
// tb.KeyDown += OnPreviewKeyDown;
// }
}