title: ListView's refresh command not working with binded IRelayCommand
body: <p>I created a form with listview and ISingleOperation fo data refresh.</p>
  
  <p>Then i created command in ViewModel.</p>
  
  <pre><code> public IRelayCommand LoadInvoicesCommand
      {
          get
          {
              return GetCommand(() =&gt; Execution.ViewModelExecute(new LoadInvoicesOperation(_model), 10000));
          }
      }
  </code></pre>
  
  <p>ISingleOperation works well and returns </p>
  
  <pre><code>new Result() { ResultAction = ResultType.None };
  </code></pre>
  
  <p>Refresh operation is bound well</p>
  
  <pre><code>RefreshCommand="{Binding LoadInvoicesCommand}"
  </code></pre>
  
  <p>But  refresh indicator "hangs" and not disapearing, what is wrong here?</p>