title: Cannot find view for ViewModel
body: <p>I have a wpf application using Caliburn.Micro. I have a view MyView:</p>
  
  <pre><code>&lt;UserControl x:Class="ReferenceMaintenanceWorkspace.MyView"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           &gt;
    &lt;UserControl.Resources&gt;
   &lt;/UserControl.Resources&gt;
   &lt;TabControl x:Name="Items" &gt; 
  &lt;/TabControl&gt;
  </code></pre>
  
  <p></p>
  
  <p>I have also MyViewModel:</p>
  
  <pre><code>using System.ComponentModel.Composition;
  
  namespace ReferenceMaintenanceWorkspace
  {
  [Export(typeof(MyViewModel))]
  public class MyViewModel
  {
    public MyViewModel()
    {
        base.DisplayName = "Reference Maintenance";
    }
  </code></pre>
  
  <p>Because of some reason, I get the following message on the tab control:</p>
  
  <p>Cannot find view for ReferenceMaintenanceWorkspace.MyViewModel.</p>
  
  <p>Could you please explain why this could happen?
  Thanks.</p>