title: Trigger doesn't work on ToggleButton.IsChecked property
body: <p>Here is a simple XAML with trigger that should change ToggleButton content when it is checked. But for some reason it doesn't work. I have a silly feeling that I missed something extra small. Appreciate your help</p>
  
  <pre><code>&lt;ToggleButton Content="&amp;lt;"&gt;
      &lt;ToggleButton.Style&gt;
          &lt;Style TargetType="ToggleButton"&gt;
              &lt;Style.Triggers&gt;
                  &lt;Trigger Property="IsChecked" Value="True"&gt;
                      &lt;Setter Property="Content" Value="&amp;gt;" /&gt;
                  &lt;/Trigger&gt;
              &lt;/Style.Triggers&gt;
          &lt;/Style&gt;
      &lt;/ToggleButton.Style&gt;
  &lt;/ToggleButton&gt;
  </code></pre>