title: f# xaml "this.factory" does not contain CommandSync
body: <p>I have a strange error with fsxaml and F#. I have a view model and I want to make a call to CommandSync from the factory property but it's not available. Actually it's empty, no functions available. What am I missing here?</p>
  
  <p>code : </p>
  
  <pre><code>namespace ViewModels
  
  open ViewModule
  
  
  type MainViewModel() as this =
      inherit ViewModelBase()
  
      let launch() = this.Factory.CommandSync(fun _ -&gt; ())
  
      member this.LaunchBtn = launch()
  </code></pre>
  
  <p>P.S I have the ViewModule reference already</p>