title: Caliburn.Micro Action with parameter not binding
body: <p>I have a textbox with the following:</p>
  
  <pre><code>&lt;i:Interaction.Triggers&gt;
   &lt;i:EventTrigger EventName="KeyUp" &gt;                                               
       &lt;cal:ActionMessage MethodName="OnKeyUp" &gt;
            &lt;cal:Parameter Value="$eventArgs"/&gt;
       &lt;/cal:ActionMessage&gt;
   &lt;/i:EventTrigger&gt;
  </code></pre>
  
  <p></p>
  
  <p>If I run this, an error message is produced saying "No target found for Method OnKeyUp."  If I remove the parameter from the message, and the method, then it runs fine.</p>
  
  <p>This is the method.</p>
  
  <pre><code>public void OnKeyUp(object sender, KeyEventArgs e) {
          MessageBox.Show(e.Key.ToString());
      }
  </code></pre>
  
  <p>I don't see what the issue is.</p>