title: Ui Doesn't getUpdated
body: <p>this is my code:</p>
  
  <pre><code>&lt;Window x:Class="WpfApplication1.Window2"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window2" Height="300" Width="300"&gt;
  &lt;Grid&gt;
      &lt;Grid.RowDefinitions&gt;
          &lt;RowDefinition Height="60*" /&gt;
          &lt;RowDefinition Height="202*" /&gt;
      &lt;/Grid.RowDefinitions&gt;
      &lt;Button Click="Button_Click"&gt;Click Me&lt;/Button&gt;
      &lt;ListView ItemsSource="{Binding Numbers}" Grid.Row="1"&gt;
      &lt;/ListView&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p></p>
  
  <pre><code> public partial class Window2 : Window {
  
    public int index =0;
    public ObservableCollection&lt;int&gt; Numbers { get; set; }
  
    public Window2() {
  
       Numbers = new ObservableCollection&lt;int&gt;() { index, index, index, index };
       InitializeComponent();
       DataContext = this;
    }
  
    private void Button_Click(object sender, RoutedEventArgs e) {
       Numbers = new ObservableCollection&lt;int&gt;() { index, index, index, index };
       index++;
    }
  </code></pre>
  
  <p>}</p>