title: Binding XAML usercontrol in XAML
body: <p>I have two UserControls: <strong>Main</strong> nad <strong>Settings</strong>.
  In <strong>Main</strong> in some control I want to set CommandParameter in XAML to <strong>Settings</strong>. In C# code is simple, like:</p>
  
  <pre><code>biSettings.CommandParameter = new Settings();
  </code></pre>
  
  <p>How can I do that in XAML?</p>
  
  <pre><code>CommandParameter="???"
  </code></pre>
  
  <p>The Settings has own model I'm using MVVM. I found solutions here <a href="https://stackoverflow.com/questions/5299022/binding-usercontrol-in-xaml">Binding UserControl in XAML</a>, but It is not clear MVVM because in VM is MV!
  I'm using Silverlight 4.</p>