title: Change content of WPF Window
body: <p>When I click on a Button on my navigation bar, a new Window opens. For example: </p>
  
  <pre><code>    private void btFinanzen_Click(object sender, RoutedEventArgs e)
      {
          Finanz mw = new Finanz(login);
          mw.Show();
  
      }
  </code></pre>
  
  <p>Now, I don´t want to show it in a new window. Instead of that, I want it to be shown at the same window. I tried with the following: </p>
  
  <pre><code>    private void btFinanzen_Click(object sender, RoutedEventArgs e)
      {
          Finanz mw = new Finanz(login);
          //mw.Show();
          this.Content = Finanz f;
  
      }
  </code></pre>
  
  <p>but it failed.
  What I should say is, that I´ve many of different windows now and want them all to be shown at one window - each by clicking a different button. 
   How can I manage this?</p>