title: WP7 Silverlight - Change DataContext in runetime
body: <p>how do I change the DataContext to another view model in runtime.
  Now the data is not changed, after I run the click event:</p>
  
  <pre><code>    public PivotPage1()
      {
          InitializeComponent();
          DataContext = App.TeamDocViewModel;
      }
  
      private void Button_Click(object sender, EventArgs e)
      {
          DataContext = App.TaskViewModel;
      }
  </code></pre>
  
  <p>Some suggestions?</p>