title: SortDescriptions
body: <p>I'm using c# in combination of WPF.</p>
  
  <p>I've used a <code>CollectionView</code> with a single <code>SortDescription</code>. But in certain cases the <code>SortDescription</code> is not used. Yet I couldn't find out why this is happening.</p>
  
  <p>The <code>ComboBox</code> isn't sorted for some reason. When I add a second <code>SortDescription</code> with the same sorting option it also happens.</p>
  
  <p>No <code>cv.sortdescriptions.clear();</code> is used for this particular <code>SortDescription</code>.
  In 99% of the cases it works perfect, but somehow for one reason yet this happening.</p>
  
  <p>Anyone have a clue?</p>