title: WPF Radio Button IsChecked not working
body: <p>I have two radio buttons and I want one to be selected by default. I added <code>IsChecked="true"</code> , but it doesn't work. I also tryed to set it in the window load. </p>
  
  <p>But when I click the second option and then click the first option, everything works fine.</p>
  
  <p>It just doesn't show up clicked at first load.</p>
  
  <pre><code>&lt;StackPanel Orientation="Vertical" Margin="0 3 0 0" Height="55"&gt;
      &lt;RadioButton IsChecked="True" Padding="1 1 0 10" Name="AutoSaveRadioButton"&gt;
          &lt;TextBlock Foreground="Black"&gt;Auto Save Test File&lt;/TextBlock&gt;
      &lt;/RadioButton&gt;
      &lt;RadioButton Margin="0 1 0 0" Padding="1 1 3 1" Name="SaveFileTogetherRadioButton"&gt;
          &lt;TextBlock Foreground="Black"&gt;Save Test File &amp;amp; &lt;LineBreak /&gt; output file together&lt;/TextBlock&gt;
      &lt;/RadioButton&gt;
  &lt;/StackPanel&gt;
  </code></pre>