title: MahApps.Metro MetroTabControl with Caliburn
body: <p>i try to raise the TabItemClosingEvent of the Controls:MetroTabControl.</p>
  
  <p>XAML:</p>
  
  <pre><code>&lt;Controls:MetroTabControl cal:Message.Attach="[Event TabItemClosingEvent] = [Action CloseConnection($source, $eventArgs)];" DockPanel.Dock="Top" Background="{x:Null}" ItemsSource="{Binding Connections.View}" SelectedItem="{Binding SelectedConnection}"  Margin="10,0"&gt;
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>public void CloseConnection(object sender, BaseMetroTabControl.TabItemClosingEventArgs e)
  {
  e.Cancel = false;
  }
  </code></pre>
  
  <p>CloseConnection is never called. Somebody can see my fault?</p>
  
  <p>Thank you</p>