title: Nested MvxListView binding failure
body: <p>Is it possible to nest bound MvxListView's (mvvmcross android v3.1 series)? </p>
  
  <p>I'm finding the nested bind fails with:</p>
  
  <pre><code>MvxBind:Warning:  1.17 Unable to bind: source property source not found Property:Command on MenuSection
  </code></pre>
  
  <p>Our ViewModel looks a bit like </p>
  
  <pre><code>   class SomeViewModel : MvxViewModel{
         public List&lt;MenuSection&gt; Sections{get;set;}
     }
  </code></pre>
  
  <p>where </p>
  
  <pre><code>class MenuSection{
     public string Title{get;set;}
     public MenuItem[] Items{get;set;}
  }
  class MenuItem{
     public string Name {get;set;}
     public ICommand Command{get;set;}
  }
  </code></pre>
  
  <p>Cutdown version of the axml with most non-mvx attributes removed looks like:</p>
  
  <p><strong>layout/page_home.axml</strong></p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout&gt;
    &lt;FrameLayout android:id="@+id/content_frame"/&gt;
    &lt;Mvx.MvxListView
          local:MvxBind="ItemsSource Sections"
          local:MvxItemTemplate="@layout/item_menusection" /&gt;
  &lt;/android.support.v4.widget.DrawerLayout&gt;
  </code></pre>
  
  <p><strong>layout/item_menusection.axml</strong></p>
  
  <pre><code>&lt;LinearLayout&gt;
    &lt;TextView local:MvxBind="Text Title"/&gt;
    &lt;Mvx.MvxListView
        local:MvxItemTemplate="@layout/item_menusection_item"
        local:MvxBind="ItemSource Items; ItemClick Command" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p><strong>layout/item_menusection_item.axml</strong></p>
  
  <pre><code>&lt;TextView local:MvxBind="Text Name"/&gt;
  </code></pre>