title: Windows Style from ResourceDictionary don't apply
body: <p>As I have multiple <code>Window</code>s in my application, I am looking for a solution that does not require me to set a <code>binding</code> on each <code>Window</code>.</p>
  
  <p>I created a <code>ResourceDictionary</code> which has a <code>style</code> for the Window Background:</p>
  
  <pre><code>&lt;Style TargetType="{x:Type Window}"&gt;
      &lt;Setter Property="Background" Value="AliceBlue"/&gt;
  &lt;/Style&gt;
  </code></pre>
  
  <p>In my <code>XAML</code>, I set the <code>ResourceDictionary</code>:</p>
  
  <pre><code>&lt;Window.Resources&gt;
      &lt;ResourceDictionary&gt;
          &lt;ResourceDictionary.MergedDictionaries&gt;
              &lt;ResourceDictionary Source="Templates.xaml" /&gt;
          &lt;/ResourceDictionary.MergedDictionaries&gt;
      &lt;/ResourceDictionary&gt;
  &lt;/Window.Resources&gt;
  </code></pre>
  
  <p>There is no error, but my <code>Window</code> color stays white. </p>