title: WPF Combobox display entity name in dropdown instead of DisplayMemberPath
body: <p>I have the following combobox:</p>
  
  <pre><code>&lt;ComboBox Name="cbBonusType" 
            DisplayMemberPath="BonusTypeName"  
            SelectedValuePath="ID" Width="150" Margin="10,0,0,0"                  
            SelectionChanged="cbBonusType_SelectionChanged"/&gt;
  </code></pre>
  
  <p>When running:
  When selecting an item, the combobox shows exactly the right string.
  But while the droppbox is open, the named displayed in the droppbox are <strong>all</strong> set to the name of the entity: "CaSaMa.WPF.UI.Competiotion.BonusType". </p>
  
  <p>Why is that and how do I fix it?</p>