title: How to load a ComboBox in UWP?
body: <p>I have the following <code>ComboBox</code> in XAML:</p>
  
  <pre><code>&lt;ComboBox Header="Cities" Width="245" SelectedItem="{Binding Cities, Mode=TwoWay}"/&gt;
  </code></pre>
  
  <p>And I need to populate it with a List in a <code>ViewModel</code>:</p>
  
  <pre><code>public List&lt;City&gt; Cities = new List&lt;City&gt;();
  </code></pre>
  
  <p>The list is populated by a query that is run in the API:</p>
  
  <pre><code>public async void CargarCiudades()
  {
     var List = await App.Repository.City.GetAsync();
     foreach (var i in List)
     {
          this.Cities.Add(i);
     }
  }
  </code></pre>
  
  <p>I need to load the ComboBox with the contents of the Cities list. How can I do it?</p>